productivity differences across employers the roles of employer size age and human capital recent research using longitudinal microeconomic databases on businesses and individuals has uncovered tremendous heterogeneity across businesses even within narrowly defined industrial sectors we observe large differences in the levels and growth rates of inputs outputs and productivity across workers even controlling for demographic characteristics wage and employment outcomes vary a great deal and there are sizable worker flows across jobs in the economy these worker flows are closely connected to firm outcomes reflecting in large part the ongoing shift in resources from less productive to more productive employers the primary message is that the continual process of matching and sorting as businesses and workers seek their niches is heterogeneous with experimentation learning and selection all playing important roles understanding the connection between the matching and sorting of businesses and workers is at the very heart of the overlap between industrial organization and labor economics however due to the paucity of data linking businesses and workers at the micro level we know relatively little about these interactions although a large empirical literature suggests that worker outcomes are associated with firm characteristics notable examples are firm size wage effects compensating wage differentials and interindustry wage differentials very little is known about the converse the process by which business outcomes are associated with the characteristics of their employees there are a number of questions associated with this process do employers choose different modes of production resulting in skill segregation as suggested by the sorting and assignment hypotheses in michael kremer 1993 and michael sattinger 1993 or do all firms in a given industry select roughly the same workforce composition how do employers change their workforce composition either to accommodate demand shocks or to experiment with new modes of production in turn what is the connection between these different decisions regarding workforce composition and observable business outcomes such as survival growth and productivity in this short paper our empirical objectives are relatively modest compared to these broad research questions our focus is to provide an initial investigation into the connection between a key measure of firm performance labor productivity and the composition of the firm s workforce as measured by observable worker characteristics we exploit longitudinal matched employeremployee micro data developed under a recent pilot project at the u s census bureau our data set contains longitudinal information on key outcomes of the businesses as well as many of the basic demographic characteristics for the universe of workers at these businesses although longitudinal matched employer employee micro data have been developed in a variety of countries over the last decade or so see john abowd and francis kramarz 1999 ours is the first large scale micro level data set in the united states that allows the investigation haltiwanger department of economics university of maryland college park md 20742 u s bureau of the census and nber lane department of economics american university washington dc 20016 and u s bureau of the census spletzer bureau of labor statistics 2 massachusetts ave n e washington dc 20212 we thank adela luque and javier miranda for superb research assistance and charles brown and marilyn manser for comments on an earlier draft this research was conducted at the center for economic studies at the u s bureau of the census while the second author was an american statistical association census bureau fellow the analysis and results are attributable to the authors and do not necessarily reflect concurrence of the institutions they represent

decentralized matching and social segregation social segregation is a ubiquitous feature of human life people segregate along the lines of income religion ethnicity language and other characteristics this study provides the first experimental examination of decentralized matching with search frictions and institutionalized segregation the findings indicate that without a segregation institution high types over segregate relative to the equilibrium prediction we observe segregation attempts even when equilibrium suggests that everyone should accept everyone else in the presence of a segregation institution we find that while the symmetric segregation institution increases matching success rate and efficiency in one environment it has weak or no effect in a steep incentive environment by adding an entry cost to a flat incentive market however the asymmetric segregation institution leads to an increased matching success rate and efficiency in both environments which underscores the importance of a coordination device

a theory of self selection in a market with matching frictions an application to delay in refereeing times in economics journals abstract a matching market with imperfect information is studied with imperfect information it is shown that friction in a meeting process can facilitate self selection and thus may improve the matching outcome as an application the effect of delay in refereeing time on publication outcome is analyzed in a publication process in economics journals though the delay causes efficiency loss by postponing the dissemination of new research it will better sort the papers to each journal by their qualities by preventing mediocre papers from being submitted to a prestigious journal and published by luck if an assortative outcome good papers in prestigious journals and mediocre papers in less prestigious journals is efficient the delay may actually improve the publication outcome other matching market examples are also discussed

skills in the city this paper documents the allocation of skills across cities and estimates the impact of agglomeration on the hedonic prices of worker skills we find that large cities are more skilled than are small cities but only to a modest degree we also show that the increase in productivity associated with agglomeration as measured by the urban wage premium is larger for workers with stronger cognitive and people skills in contrast motor skills and physical strength are not rewarded to a greater degree in large cities urbanization thus enhances thinking and social interaction rather than physical abilities these results are robust to a variety of estimation strategies including using nlsy variables that control for worker quality and a worker msa fixed effect specification

cities matching and the productivity gains of agglomeration abstract the striking geographical concentration of economic activities suggests that there are substantial benefits to agglomeration however the nature of those benefits remains unclear in this paper we take advantage of a new data set to quantify the role of one of the main contenders the matching of workers and jobs we show that thicker urban labor markets are associated with more assortative matching in terms of worker and firm quality when we estimate establishment level production functions we also find evidence of complementarities between worker and firm quality putting together the production and matching relationships we show that production complementarity and assortative matching is an important source of the urban productivity premium

unravelling of dynamic sorting we consider a two sided finite horizon search and matching model with heterogeneous types and complementarity between types the quality of the pool of potential partners deteriorates as agents who have found mutually agreeable matches exit the market when search is costless and all agents participate in each matching round the market performs a sorting function in that high types of agents have multiple chances to match with their peers however this sorting function is lost if agents incur an arbitrarily small cost in order to participate in each round with a sufficiently rich type space the market unravels as almost all agents rush to participate in the first round and match and exit with anyone they meet copyright 2005 wiley blackwell

search sorting and urban agglomeration studies have suggested that urban agglomeration enhances productivity by facilitating the firm worker matching process this article develops a model that formalizes this notion and demonstrates that when firm capital and worker skill are complementary in production urban agglomeration will tend to generate more efficient yet segregated matches as a result not only will local market size be positively associated with average productivity it will also generate greater between skill group wage inequality and a higher expected return to skill acquisition recent data from the counties and metropolitan areas of the united states is consistent with each of these implications

new roles for marriage in urban africa kinship networks and the labor market in kenya abstract this paper explores new roles that traditionally rural kinship networks organized around the marriage institution might play in improving labor market outcomes in urban africa using new data from kisumu kenya and controlling for selection into marriage we find that marriage significantly increases employment levels and incomes in our sample of migrants at the same time marriage increases the remittances that migrants send to the extended family consistent with the view that the benefits of the network come with additional social obligations these obligations appear to be borne disproportionately by high ability individuals who consequently defer marriage the negative selection into marriage that we uncover has consequences for the future viability of the urban networks with implications for long term growth and distribution in this economy

why dowry payments declined with modernization in europe but are rising in india in contrast to most dowry oriented societies in which payments have declined with modernization those in india have undergone significant inflation over the last five decades this paper explains the difference between these two experiences by focusing on the role played by caste the theoretical model contrasts caste and non caste based societies in the former there exists an inherited component to status caste that is independent of wealth and in the latter wealth is the primary determinant of status modernization is assumed to involve two components increasing average wealth and increasing wealth dispersion within status or caste groups the paper shows that in caste based societies the increases in wealth dispersion that accompany modernization necessarily lead to increases in dowry payments whereas in non caste based societies increased dispersion has no real effect on dowry payments and increasing average wealth causes the payments to decline

an equilibrium model with involuntary unemployment at flexible competitive prices and wages this paper presents a general equilibrium model in which all prices and quantities transacted are the direct choices of econom ic agents there is no walrasian auctioneer multiple subgame perfect equilibria exist with prices and wages at their walrasian levels among the equilibrium allocations are the walrasian ones but there a re also outcomes in which price and wage taking workers are rationed in the labor market and are unable to sell all the labor they want a t the prevailing wage this involuntary unemployment results from sel f fulfilling expectations of inadequate excess demand as in some inte rpretations of keynes s ideas copyright 1987 by american economic association

productivity gaps and underemployment abstract we examine the relationship between productivity gaps inside an industry and the level of employment in the economy in the context of a simple general equilibrium model which comprises a cournot industry we find that underemployment is minimized when such productivity gaps disappear

dynamic analysis of consumer response to marketing strategies this paper develops a methodology for modeling consumer response that integrates previous research in stochastic brand selection diffusion of innovation test market analysis and new product design the methodology makes it practical to extend brand selection models to include diffusion phenomena such as awareness trial and information flow purchase timing and brand selection are interdependent and both phenomena depend jointly on managerial controls such as advertising coupons price off promotion product positioning and consumer characteristics within this general structure we provide practical estimation procedures a least squares approximation to the maximum likelihood estimates to determine the parameters which link managerial controls to consumer response closed form solutions are derived for cumulative awareness cumulative trial penetration expected sales and purchases due to promotion all as a function of time we also provide simplified expressions for equilibrium t market share tradeoffs among complexity of the diffusion process number of managerial variables nonstationarity complexity of purchase timing consumer segmentation and sample size are made explicit so that the marketing scientist can customize his analyses to the managerial problems that he faces the effects of sample size data interval frequency and collinearity in the explanatory variables are investigated with simulations based on a five state consumer response process which depends on 8 10 marketing variables the paper closes with a brief description of the application and predictive test of a consumer response model based on the methodology

household formation inequality and the macroeconomy this paper examines how family structure can influence the macroeconomy it uses a simple model where the key features are taken as exogenous and shows that the sorting of individuals into families can have important quantitative effects on human capital formation inequality and income it then discusses how these features can be endogenized and suggests avenues

consumer choice and competition policy a study of uk energy markets consumer choice is increasingly recognised as a crucial factor in competition policy to illustrate the implications of such choice we present an investment model of the switching choice in the uk residential natural gas market and examine responses to a specially commissioned survey of nearly seven hundred consumers identifying search and switching costs through an assessment of the savings which consumers say they require to switch supplier together with an evaluation of consumer switching behaviour we deduce that the incumbent retained considerable market power suggesting that some continued regulation may be necessary

urban wages and labor market agglomeration abstract using the 5 public use micro sample of the 1990 u s census we find that observationally equivalent workers in the manufacturing sector earn higher wages when they are in urban labor markets that have a larger share of national or metropolitan employment in their same occupation and industry groups quantitatively the effect is large with an elasticity measured at the means of between 1 2 and 3 6 for these effects we interpret the willingness of firms to pay more for equivalent workers in dense markets as evidence of an agglomeration economy in urban labor

sorting and decentralized price competition we investigate the role of search frictions in markets with price competition and how it leads to sorting of heterogeneous agents there are two aspects of value creation the match value when two agents actually trade and the probability of trading governed by the search technology we show that positive assortative matching obtains when complementarities in the former outweigh complementarities in the latter this happens if and only if the match value function is root supermodular that is its nth root is supermodular where n reflects the elasticity of substitution of the search technology this condition is weaker than the condition required for positive assortative matching in markets with random search

sex preferences marital dissolution and the economic status of women author s bedard kelly deschenes olivier abstract the rise in the divorce rate over the past 40 years is one of the fundamental changes in american society a seemingly ever increasing number of women and children spend some fraction of their life in single female headed households leading many to be concerned about the economic circumstances of these women their and children estimating the cause to effect relationship between marital dissolution and female economic status is complicated because the same factors that increase marital instability may also affect the economic status and labor market behavior of women we propose an instrumental variables solution to this problem based on the sex of the firstborn child this strategy exploits the fact that the sex of the firstborn child is random and the fact that marriages are less likely to survive following the birth of girls as opposed to boys our iv estimates cast doubt on the contention that marital instability causes large declines in woman s economic status once the negative selection into divorce is accounted for we find that women who have experienced marital dissolution have considerably higher levels of personal income and annual wages than women who remain married at the same time we find little evidence of differential poverty rates and equivalized household incomes among ever divorced women and never divorced women we further show that the higher wages of ever divorced women mostly reflect increased labor supply intensity hours and weeks of work of woman who experienced marital dissolution

bargaining in dynamic markets abstract we study non stationary markets in which traders are randomly matched to bargain over the price of a heterogeneous good or the terms of a partnership the economy consists of a continuum of players drawn from a finite set of types players exogenously enter the market over time and exit upon trading at every date matching probabilities for each pair of types are determined by the endogenous distribution of trader types in the market the balance of bargaining power at any stage depends on variations in potential gains from trade the inflows of new traders the structure of agreements at future dates and the induced frequency of trading opportunities we establish that an equilibrium always exists moreover all equilibria that lead to the same evolution of the economy are payoff equivalent however we show that multiple self fulfilling expectations about the trajectory of the economy generating distinct equilibrium dynamics and payoffs may coexist

birth rates and the vietnam draft during the vietnam conflict over 8 million americans served in the armed forces and almost 3 5 million were deployed to southeast asia department of veterans affairs the war is considered by some to be the defining event of that generation not just because of the number of troops deployed the largest since the second world war but because of how it affected all men of that generation those who served as well as those who were able to avoid service while a large literature has examined effects of the draft on postwar outcomes for veterans effects of the wartime mobilization on family formation during the time of the conflict have been largely ignored the mobilization led to the absence of a large number of young men from local marriage markets and this shock to sex ratios could have significantly disrupted normal family formation patterns including assortative matching and fertility behavior 1 in this paper we exploit variation across states and over time on vietnam era inductions to analyze the effects of the wartime mobilization on

decision making under uncertainty capturing dynamic brand choice processes in turbulent consumer goods markets we construct two models of the behavior of consumers in an environment where there is uncertainty about brand attributes in our models both usage experience and advertising exposure give consumers noisy signals about brand attributes consumers use these signals to update their expectations of brand attributes in a bayesian manner the two models are 1 a dynamic model with immediate utility maximization and 2 a dynamic forward looking model in which consumers maximize the expected present value of utility over a planning horizon given this theoretical framework we derive from the bayesian learning framework how brand choice probabilities depend on past usage experience and advertising exposures we then form likelihood functions for the models and estimate them on nielsen scanner data for detergent we find that the functional forms for experience and advertising effects that we derive from the bayesian learning framework fit the data very well relative to flexible ad hoc functional forms such as exponential smoothing and also perform better at out of sample prediction another finding is that in the context of consumer learning of product attributes although the forward looking model fits the data statistically better at conventional significance levels both models produce similar parameter estimates and policy implications our estimates indicate that consumers are risk averse with respect to variation in brand attributes which discourages them from buying unfamiliar brands using the estimated behavioral models we perform various scenario evaluations to find how changes in marketing strategy affect brand choice both in the short and long run a key finding obtained from the policy experiments is that advertising intensity has only weak short run effects but a strong cumulative effect in the long run the substantive content of the paper is potentially of interest to academics in marketing economics and decision sciences as well as product managers marketing research managers and analysts interested in studying the effectiveness of marketing mix strategies our paper will be of particular interest to those interested in the long run effects of advertising note that our estimation strategy requires us to specify explicit behavioral models of consumer choice behavior derive the implied relationships among choice probabilities past purchases and marketing mix variables and then estimate the behavioral parameters of each model such an estimation strategy is referred to as structural estimation and econometric models that are based explicitly on the consumer s maximization problem and whose parameters are parameters of the consumers utility functions or of their constraints are referred to as structural models a key benefit of the structural approach is its potential usefulness for policy evaluation the parameters of structural models are invariant to policy that is they do not change due to a change in the policy in contrast the parameters of reduced form brand choice models are in general functions of marketing strategy variables e g consumer response to price may depend on pricing policy as a result the predictions of reduced form models for the outcomes of policy experiments may be unreliable because in making the prediction one must assume that the model parameters are unaffected by the policy change since the agents in our models choose among many alternative brands their choice probabilities take the form of higher order integrals we employ monte carlo methods to approximate these integrals and estimate our models using simulated maximum likelihood estimation of the dynamic forward looking model also requires that a dynamic programming problem be solved in order to form the likelihood function for this we use a new approximation method based on simulation and interpolation techniques these estimation techniques may be of interest to researchers and policy makers in many fields where dynamic choice among discrete alternatives is important such as marketing decision sciences labor and health economics and industrial organization

removing heterogeneity bias from logit model estimation this paper introduces a new estimation procedure for the logit model that is an extension of a conditional estimation procedure developed by chamberlain chamberlain g 1978 on the use of panel data working paper harvard university 1 52 chamberlain g 1980 analysis of covariance with qualitative data rev econom stud 47 225 238 the method eliminates heterogeneity bias which is present in the estimates produced by traditional estimation techniques it improves the goodness of fit and explanatory power of these models while incorporating purchase event feedback

variety seeking through brand switching a concept of variety seeking behavior is modeled as a stochastic brand choice model the model yields a measure of variety seeking for each individual consumer panel data for 28 products are analyzed for each household and the possibility of market segmentation by variety seeking behavior is explored

matching with interviews abstract this paper explores how interviews affect the matching process when worker productivity is private information wages are determined by a single round of strategic bargaining after the worker is interviewed the implications of this hiring process for the efficiency of matching and the incidence and severity of statistical discrimination are considered the better are firms at identifying productive workers the worse the average quality of the unemployment pool so interviewing tends to slow down matching for every one multiple pareto rankable equilibria are possible such that any social group in a bad equilibrium faces stricter hiring standards longer spells of unemployment and lower welfare

truthtelling in matching markets we analyze a search and matching model with non transferable utility and asymmetric information randomly paired agents go through an evaluation phase at the end of which they discover each other s types and choose to match or not before deciding to enter this phase agents can communicate through cheap talk we provide conditions for this communication to be informative and we examine how it affects agents welfare we show that communication is pareto improving only when the matching is assortative in the absence of communication and left unchanged by information transmission

education segregation and marital sorting theory and an application to the uk abstract this paper presents a model of the intergenerational transmission of education and marital sorting parents matter both because of their household income and because their human capital determines the distribution of a child s disutility from making an effort to become skilled we show that an increase in segregation has potentially ambiguous effects on the proportion of individuals that become skilled in the steady state and hence on marital sorting the personal and household income distribution and welfare we calibrate the steady state of our model to uk statistics we find that an increase in the correlation of spouses in their years of education will bring about a small increase in the proportion of skilled individuals when the relative supply of skilled individuals is variable at the family level and a decrease when this supply is fixed ex ante utility of an unborn individual increases in the first case and decreases in the second the welfare effect of increased sorting is negative for unskilled individuals and positive for skilled individuals increased segregation always leads to an increase in welfare inequality between skilled and unskilled individuals

monopolistic competition risk aversion and equilibrium recessions this paper considers a model with monopolistic competition and multiple equilibria rankable by output employment and the pareto criterion while papers in the literature assume a linear production technology and derive a continuum of equilibria we assume a standard diminishing returns production function and find a finite set of equilibria our new feature is the assumption that firms behave in a risk averse manner a low level equilibrium is sustainable because firms at the low profits level associated with the equilibrium become extremely cautious in their employment decisions

information externalities and intermediaries in frictional search markets in frictional matching markets with heterogeneous buyers and sellers sellers incur discrete showing costs to show goods to buyers who incur discrete inspection costs to assess the suitability of the goods on offer we study how brokers can help reduce these costs by managing the level and mix of goods in their inventory intermediaries emerge and improve social welfare when there is sufficient heterogeneity in the types of goods and preferences learning and inventory management enable search intermediaries to internalize information externalities generated in unintermediated private search resume externalites informationnelles et intermediaires dans des marches frictionnels de recherche dans des marches frictionnels d arrimage ou acheteurs et vendeurs sont heterogenes les vendeurs doivent encourir des couts separes pour montrer leurs produits aux acheteurs qui doivent pour leur part encourir des couts separes d inspection pour s assurer que les biens offerts leur conviennent on etudie comment des courtiers peuvent aider a reduire ces couts en gerant le niveau et la mixite des biens dans leurs inventaires des intermediaires emergent qui ameliorent le bien etre social quand il y a heterogeneite suffisante des types de biens et de preferences l apprentissage et la gestion des inventaires permettent aux intermediaires de recherche d internaliser les externalites informationnelles engendrees dans le processus de recherche privee sans l aide d intermediaires

targeted search with horizontal differentiation in the marriage market abstract we develop a search matching model in the marriage market with heterogeneous men a continuum of types and heterogeneous women a finite number of types the model has two distinguishing features first men and women are also horizontally differentiated second the search is targeted each type of woman constitutes a distinctive submarket and men are able to choose beforehand in which submarkets to participate but the search is random within each submarket we show that there is always a unique equilibrium in which men are endogenously segmented into different submarkets and that the equilibrium matching pattern is weakly positive assortative we then explore how the equilibrium marriage pattern changes horizontally and vertically as some exogenous shocks occur in particular we show that an internet induced increase in search efficiency would make the marriage pattern overall more assortative while an increase in the dispersion of the horizontal match fitness could make the marriage pattern overall less assortative

estimating a multinomial probit model of brand choice using the method of simulated moments the multinomial probit model of brand choice is theoretically appealing for marketing applications as it is free from the independence of irrelevant alternatives property of the multinomial logit model however difficulties in estimation have restricted its widespread use in marketing this paper presents an application of the method of simulated moments a new methodology that enables easy estimation of probit models with a large number of alternatives in the choice set we describe the theoretical development of the technique and using pseudo simulated data conduct numerical experiments to compare the method with existing techniques for estimating probit models using the scanner panel data on the purchases of catsup we provide an empirical application of the method of simulated moments to the estimation of the parameters of a multinomial probit model estimating the covariance structure associated with the underlying latent variable probit model enables us to identify broad patterns of similarities across alternatives it also enables us to derive a pairwise similarity matrix across choice alternatives which when input into a multi dimensional scaling routine provides us with a graphical representation of competitive structure in the catsup market for completeness we compare the substantive implications for the effects of marketing variables obtained from the multinomial probit model with those obtained from models in the extant marketing literature

multiple equilibria and minimum wages in labor markets with informational frictions and heterogeneous production technologies it is often argued that a mandatory minimum wage is binding only if the wage density displays a spike at it in this article we analyze a model with search frictions and heterogeneous production technologies in which imposition of a minimum wage affects wages even though after imposition the lowest wage in the market exceeds the minimum wage the model has multiple equilibria as a result of the fact that the reservation wage of the unemployed and the lowest production technology in use affect each other imposition of a minimum wage may improve social welfare

a spillover based theory of credentialism i propose a model in which credentials such as diplomas are instrumentally valuable to workers the model avoids an important criticism of standard job market signalling models by tying a worker s wage to their output a worker s productivity is influenced by the skills of their co workers where such skills arise from an ability augmenting investment that is made prior to matching with co workers credentials allow workers to demonstrate their investment to the labour market thereby allowing them to match with high skill co workers in equilibrium despite the positive externality associated with a worker s investment i show how overinvestment is pervasive in equilibrium

a multivariate polya model of brand choice and purchase incidence in this paper we develop an integrated stochastic model of purchase timing and brand selection which incorporates the influence of marketing mix variables seasonality and trend and also allows for various individual choice mechanisms our approach rests on the assumptions of a zero order choice process a poisson timing process and purchase rates following a multivariate gamma distribution over the population the scale parameters of which vary according to marketing activities and time the resulting model is a multivariate polya process and the distribution of brand choice probabilities turns out to be a generalized dirichlet distribution thus most currently used zero order models can be considered to be special cases of this approach furthermore we derive a number of market diagnostics which provide insights into market structure and demonstrate the model s use for marketing strategy simulation based on extensive testing of the underlying hypotheses we finally validate the model using empirical data and show that it fits the market in question

sorting through search and matching models in economics toward understanding assortative matching this is a self contained introduction to research on search and matching we first explore the nontransferable and perfectly transferable utility matching paradigms and then a unifying imperfectly transferable utility matching model motivated by some unrealistic predictions of frictionless matching we flesh out the foundational economics of search theory we then revisit the original matching paradigms with search frictions we finally allow informational frictions that often arise such as in college student sorting

frictional assignment i efficiency abstract this paper examines the two sided matching problem where the agents on each side of the market are heterogeneous and the matching process is time consuming this is cast in a labor market setting where workers of different skills match with different machine qualities i characterize the efficient allocation and then show that it can be decentralized by a market mechanism the efficient assignment is not always positively assortative despite the fact that machine qualities and skills are complementary in production to decentralize the efficient allocation the market mechanism requires the firms to post wages and commit each machine quality to a particular skill implications on wage inequality are briefly examined journal of economic literature classification numbers j31 e24 j64

search and the efficient assignment of workers to jobs in a model in which different types of workers form matches with different types of employers a method of calculating opportunity costs of workers and jobs is derived these are shown to differ systematically from the reservation wages and profits used by workers and employers to determine whether matches should be formed ex ante differences among workers and among jobs then generate externalities in the labor market resulting in inefficient assignments of workers to jobs and multiple equilibria intervention in the labor market by altering the assignment can increase aggregate output but may cause regressive redistribution copyright 1995 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

too good to fire non assortative matching to play a dynamic game abstract we model stable non assortative labor market matchings we endogenize how transferable utility is a matched firm and worker play an infinite horizon game with one sided moral hazard becker s 1973 result that complementarity yields positively assortative matching fails because increasing match quality harms dynamic incentives a firm cannot credibly threaten to fire a worker who is productive even with low effort thus firms may prefer lower type workers who will exert more effort we offer a new interpretation of efficiency wages committing to a high wage improves effort incentives indirectly by increasing the firm s willingness to walk away we also show that the set of stable outcomes has a lattice structure

marriage and class here we consider a matching model where agents are heterogeneous and utilities nontransferable we utilize this framework to study how equilibrium sorting takes place in marriage markets we impose conditions that guarantee the existence of a steady state equilibrium and then characterize it several examples are developed to illustrate the richness of equilibria the model reveals an interesting sorting externality that can support multiple steady state equilibria even with constant returns to matching excerpt

integrated longitudinal employer employee data for the united states the development of a database infrastructure that captures the complex interactions among households and businesses at the microeconomic level and characterizes the dynamics of the modern economy is critical for the social sciences the creation of such an infrastructure has posed a major challenge to national statistical institutes since most institutes collect store and disseminate data on the engines of economic growth businesses and households in twin data silos proposals to integrate the two face technical monetary legal and policy obstacles that go far beyond the norm of datacollection activities recent efforts at the longitudinal employer household dynamics lehd program at the u s census bureau have finally made this critical data infrastructure achievable and accessible the potential uses of longitudinal integrated employer employee data are far reaching a partial list includes the effect of technological and structural change on earnings employment and productivity the analysis of the firmspecific contribution to pay the effect of firm wage setting and turnover policies on productivity the impact of firm policies on different groups of workers e g welfare recipients the effect of firm expansion exit and relocation decisions on neighborhood demographic composition the analysis of worker commuting patterns and mobility and a full accounting of the

job search in thick markets abstract i analyze empirically the effects of urban and industrial agglomeration on both search behavior and the efficiency of matching the analysis is based on a unique panel data set from the italian labor force survey micro data covering 520 randomly drawn local labor market areas 66 of the total over the four quarters of 2002 i compute transition probabilities from non employment to employment by jointly estimating the probability of searching and the probability of finding a job conditional on having searched i then test whether these are affected by market size industrial variety and or industry specialization the main results indicate that market size and industry specialization raise job seekers chances of finding employment conditional on having searched while industrial variety is not significantly different from zero finally the effect of agglomeration on non employed individuals search behavior cannot be significantly distinguished from zero

a model of brand choice and purchase quantity price sensitivities many consumer decisions involve a discrete choice and a continuous outcome examples of such decisions are whether to own a home or rent one and how much to spend which brand of orange juice to buy and how many ounces to buy in cases like these the choice decision is typically modeled separately say using a logit model and the continuous outcomes modeled separately using regression analysis however the continuous outcomes may not be independent of the discrete choice and vice versa and modeling the two decisions independently can lead to inefficient choice parameter estimates and biased and inconsistent regression parameter estimates in this paper we present a methodology from the limited dependent variable literature to model the dependence between the choice and quantity decisions our substantive interest is in the role of price in the choice and quantity decisions when choosing among alternatives we argue that consumers consider prices of all the competitive brands in the quantity decision on the other hand only the price of the chosen alternative is expected to impact how much of the alternative is purchased the analysis of three brands using disaggregate level panel data strongly supports our hypothesis about the role of competitive prices in the choice and quantity decisions

matching with noise and the acceptance curse abstract this paper explores matching with both search and information frictions specifically everyone observes only a noisy signal of the true type of any potential mate in this context matching decisions must incorporate not only information about a partner s attribute conveyed by the noisy signal but also as in the winner s curse in auction theory information about a partner s type contained in his or her acceptance decision we show that there exists an equilibrium exhibiting a stochastic positive assorting of types generalizing becker j polit economy 81 1973 813 846 in equilibrium selection is adverse being accepted reduces an agent s estimate of a potential partner s type a phenomenon that we call the acceptance curse effect

on complicated dynamics in simple monetary models we provide a complete characterization of stationary and nonstationary deterministic equilibria in search models of liquidity with indivisible assets two formulations are considered the usual one with random search and bargaining and a less common but arguably better one with directed search and posting also we consider general meeting technologies this is interesting because some results are easy with the particular technologies in previous studies but not in general as is known these models have equilibria where endogenous variables change over time as self fulfilling prophecies more surprisingly we prove there are no equilibria where they cycle in the long run

a dynamic analysis of market structure based on panel data internal market structure analysis infers brand positions in an attribute space from preference and choice data given a market in which consumers have heterogeneous tastes for attributes previous market structure models have adopted a static framework e g elrod 1988 chintagunta 1994 elrod and keane 1995 furthermore they assumed that consumer perceptions of brand attributes do not vary across consumers yet these approaches may render inaccurate representations of market structure if there is state dependence in consumer choice behavior this paper attempts to incorporate consumer choice dynamics into market structure models by specifying the source of choice dynamics explicitly in particular the process by which past purchases affect current choices is modeled in a framework which captures both consumer habit persistence and variety seeking behavior more specifically consumer preferences for brand attributes are modeled to depend on the attributes of brands bought on the previous purchase occasion furthermore the modeling approach adopted incorporates heterogeneity in both consumer preferences and perceptions of brand attributes the audience of this paper includes practitioners and academics interested in understanding consumer choice processes and inferring market structure from consumer choice data the proposed models are estimated on nielsen scanner panel data for margarine peanut butter yogurt and liquid detergent using simulated maximum likelihood techniques the empirical results suggest that accounting for choice dynamics improves both in sample and out of sample fit the results indicate that the average consumer is habit persistent in all the product categories studied this result is consistent with the findings of kannan and sanchez 1994 who conducted an aggregate analysis of consumer variety seeking behavior across product categories however the results obtained in this paper suggest that consumers are heterogeneous with respect to the processes by which past purchases affect current purchases these results provide strong evidence for habit persistence and variety seeking in brand attributes to be the behavioral source of consumer choice dynamics in food categories thus consumer tastes utility weights seem to be affected by the attributes of the brands consumed in the past given the empirical result that a large proportion of consumers are habit persistent this suggests that tastes are reinforced by the brand attributes consumed in the past the empirical results also show that not accounting for state dependence in market structure models for panel data may produce misleading results that is depending on consumer behavior patterns models that do not account for state dependence may distort the true nature of competition among brands more specifically the results confirm the expectation that if there is habit persistence that is if consumer tastes are reinforced by attributes of brands consumed in the past models that do not capture this choice dynamics will overestimate the distance between similar brands furthermore the policy experiments conducted suggest that 1 static models overestimate the short run impact of a price cut on the sales of the brand on promotion 2 price cuts hurt the sales of the more similar brands more and 3 free samples affect relatively less similar brands the most finally this paper studies variety seeking and habit persistence across brands over purchase occasions however variety seeking behavior may also involve the purchase of a portfolio of brands or items at a purchase occasion consumers may buy multiple items knowing that prior to the next trip they may want to consume different items simanson 1990 walsh 1995 this type of behavior can be modeled within the context of dynamic expected utility maximization with forward looking consumers the development and estimation of market structure models that include forward looking consumers who maximize expected utility over a planning horizon incorporating their future tastes and needs and shopping for an inventory of brands remain an important future research issue

inefficient sorting under output sharing abstract i study sorting in a frictional market asset owners post their terms then workers direct their search when the owners switch from prices to shares the competition between workers is handicapped the unique equilibrium features inefficient positive assortative matching the queue lengths are distorted even though the hosios efficiency condition holds for every pair of types for any distribution of types all workers pair up with better assets the best workers suffer while the weakest workers gain the opposite occurs on the asset side competition drives the asset owners to post flatter contracts it leads to constrained efficiency whenever prices are feasible otherwise handicapped competition results in inefficient sorting

physicians services and the division of labor across local markets this paper reports empirical evidence of systematic cross locale variation in the degree of division of labor among physicians a theoretical model based on an individual producer s trade off between increasing returns and falling marginal revenue within each activity motivates the empirical tests at two levels of aggregation specialization is correlated with local demand shifters for medical services at the individual level i find systematic differences in the range of procedures performed within a specialty class general practitioners working fewer hours practicing in more populated counties or practicing in countries with more elderly produce a narrower range of procedures

a nonparametric density estimation method for brand choice using scanner data nonparametric density estimation using a kernel method is proposed to model consumer brand choice recent availability of large scanner panel data allows the use of nonparametric approach which has few or at least fewer underlying assumptions and affords greater structural flexibility by removing as many assumptions as possible the author constructs the ultimate nonparametric model radically departing from the traditional approaches to highlight the differences in implementation and performance the proposed model does not involve either parameters that approximate certain distributions as in stochastic models or latent concepts such as utility as in utility maximization models the performance criteria include prediction of market response and brand choice share tracking and robustness under violation of various assumptions involved in parametric choice models such as correlated disturbance and misspecification the method is compared with a popular parametric counterpart the multinomial logit model on simulated and actual scanner panel data the paper emphasizes the conceptual importance of the nonparametric approach by discussing its advantages limitations and its complementary role in developing refining and diagnosing parametric models this perspective affords insight to modeling philosophy and suggests the possibility of a hybrid approach

thick market effects and churning in the labor market evidence from u s cities using u s census microdata we show that on average workers change occupation and industry less in more densely populated areas the result is robust to standard demographic controls as well as to including aggregate measures of human capital and sectoral mix analysis of the displaced worker surveys shows that this effect is present in cases of involuntary separation as well on the other hand we actually find the opposite result higher rates of occupational and industrial switching for the subsample of younger workers these results provide evidence in favor of increasing returns to scale matching in labor markets results from a back of the envelope calibration suggest that this mechanism has an important role in raising both wages and returns to experience in denser areas

birth control and female empowerment an equilibrium analysis we analyze from a theoretical perspective the impact of innovations in birth control technology on intrahousehold allocation of resources we consider a model of frictionless matching on the marriage market in which men as well as women differ in their preferences for children moreover men unlike women must marry to enjoy fatherhood we show that more efficient birth control technologies generally increase the power hence the welfare of all women including those who do not use them this empowerment effect requires that the new technology be available to single women an innovation reserved to married women may result in a disempowerment effect

an empirical index for labor market density we derive a structural index for labor market density based on the ellison glaeser index for industry concentration the labor market density index serves as a proxy for the number of workers that are potentially available for jobs in a particular area the index is based on observed home work location patterns it is particularly useful for testing theories where the scale of the market matters we apply this index to a standard wage equation and find that it explains almost half of the cross region wage variance

structural estimation of marriage models a structural approach is used to examine who matches with whom a two sided matching model that allows for marital sorting in response to marriage market flexibility and agents preferences is utilized estimation is based on imbedding the numerical solution of a matching model within a maximum likelihood procedure results indicate that wage is more desirable than education in predicting marriageability for white men education is more desirable for black men the marriage market for white men is more flexible both marriage market flexibility and the chance of being classified correctly using agents wage and education decrease with age for white men

long term partnership formation marriage and employment of course marriage and employment are different nevertheless a worker looking for a job a rm looking for worker or a single person looking for a marriage partner face similar problems as all are seeking a long term partner indeed forming long term partnerships is a common occurrence in life there are many other examples business people search for other business people to form a pro table relationship bridge players seek to nd a suitable partners students search for a good university we would all like to nd a good friend etc the problem becomes signi cant if there are substantial differences in the return obtained from forming a partnership with different partners for example employers differ in the wages they offer or in the work environment they provide in such a situation a worker may reject some job offers similarly as many have learned to their cost some make better marriage partners than others the problem is two sided while a worker is evaluating a potential employer the employer is also evaluating the worker it is this two sided aspect of the problem that generates a signi cant interest a worker s willingness to accept employment at a rm depends not only on the characteristics of the rm but also the other possible options open to the worker the better an individual s opportunities elsewhere the more selective he or she will be in evaluating a potential partnership an academic who believes harvard may make an offer in the near future will be more selective in evaluating offers from lesser universities in this way expectations play a role if a single man believes that few if any women will nd him an acceptable marriage partner then he may accept the rst opportunity that presents itself partnership formation typically does not comply with a classic market situation where all participants know everything and all trades take place at zero cost finding a job nding a husband or wife or nding a business partner is a time consuming activity where opportunities typically arrive over time at uncertain intervals of time of course we can act in ways that in uence the arrival rate of potential partner workers go to employment agencies or read help wanted advertisements in newspapers singles of a certain age go to discos or join tennis clubs the literature on search and matching sm see mortensen 1982 and pissarides 1990 for early examples 1 provides an excellent framework for the economic journal 109 june f307 f334 royal economic society 1999 published by blackwell publishers 108 cowley road oxford ox4 1jf uk and 350 main street malden ma 02148 usa

marriage and the city search frictions and sorting of singles this paper develops and tests a model where cities play an important role as marriage markets the idea is simple cities are dense areas where singles can meet more potential partners than in rural areas to enjoy those benefits they are willing to pay a premium in terms of higher housing prices once married the benefits from meeting more potential partners vanish and married couples move out of the city attractive singles benefit most from a dense market and are therefore more likely to move to the city those predictions are tested and confirmed with a unique danish data set

education matching and the allocative value of romance societies are characterized by customs governing the allocation of non market goods such as marital partnerships we explore how such customs affect the educational investment decisions of young singles and the subsequent joint labour supply decisions of partnered couples we consider two separate matching paradigms for agents with heterogeneous abilities one where partners marry for money and the other where partners marry for romantic reasons orthogonal to productivity or debt these generate different investment incentives and therefore have a real impact on the market economy while marrying for money generates greater investment efficiency romantic matching generates greater allocative efficiency since more high ability individuals participate in the labour market the analysis offers the possibility of explaining cross country differences in educational investments and labour force participation based on matching regimes

matching and sorting in online dating using data on user attributes and interactions from an online dating site we estimate mate preferences and use the gale shapley algorithm to predict sta ble matches the predicted matches are similar to the actual matches achieved by the dating site and the actual matches are approximately efficient outof sample predictions of offline matches i e marriages exhibit assortative mating patterns similar to those observed in actual marriages thus mate pref erences without resort to search frictions can generate sorting in marriages however we underpredict some of the correlation patterns search frictions may play a role in explaining the discrepancy

a model of imperfect competition with keynesian features the recent literature on the reappraisal of keynes has viewed keynesian equilibria as arising when prices are fixed and effective demands and supplies are equilibrated through the adjustment of quantities one problem with this approach is that it lacks a theory of price determination in particular of why prices are fixed in the present paper we show that a number of keynesian features arise in a model in which prices are fully flexible but where agents have some monopoly power one advantage of this approach is that it provides a theory of the determination of both prices and quantities

flexibility in consumer purchasing for uncertain future tastes consumers often simultaneously purchase multiple units in the same product category whether they are best off purchasing an assortment of alternatives or an equal number of one alternative is addressed in this paper models of an expected utility maximizing consumer are developed and it is shown that an assortment may have greater expected utility than an equal number of any one alternative the rationale is that the assortment allows the consumer to choose from inventory the alternative most appropriate for a consumption occasion using preference information not available at the purchase occasion it is also shown that when consuming alternatives from inventory the consumer may forego the alternative offering the most utility in the expectation that it will yield even more utility in the future

competitive search equilibrium with multidimensional heterogeneity and two sided ex ante investments abstract we analyze a competitive price taking search model where workers and firms make costly investments e g in education and physical capital respectively before they enter the labor market the environment features transferable utility and symmetric information a key novelty with respect to existing work is that we allow for multidimensional heterogeneity on both sides of the market the probabilities of finding and filling different jobs and the corresponding wages are determined endogenously in equilibrium we show that constrained efficient allocations can be determined as optimal solutions to a linear programming problem whereas the prices supporting these allocations and the associated expected payoffs for workers and firms correspond to the solutions of the dual of that linear program we use this characterization to show that an equilibrium exists and is constrained efficient under very general conditions the fact that linear programming techniques are used for the structural estimation of frictionless matching models suggests that our framework is potentially useful for empirical studies of labor markets and other markets where search frictions are prevalent

consumer learning brand loyalty and competition in several markets consumers can gain further information regarding how well a product fits their preferences only by experiencing it after purchase this could then generate loyalty for the products tried first this paper considers a model in which consumers learn in the first period about the product they buy and then make choices in the second period about the competing products given what they learned in the first period the paper finds that if the distribution of valuations for each product is negatively positively skewed a firm benefits is hurt in the future from having a greater market share today the brand loyalty characteristic with negative skewness two effects are identified on one hand marginal forward looking consumers are less price sensitive than myopic consumers and this is a force toward higher prices on the other hand forward looking firms realize that they gain in the future from having a higher market share in the current period and compete more aggressively in prices for similar discount factors for consumers and firms the latter effect dominates the paper also characterizes the importance of consumer learning effects on the market outcome

predictive testing of consumer choice models not subject to independence of irrelevant alternatives the probabilistic modeling of the relationship between objective or perceived characteristics of multiattribute alternatives and consumer choice is receiving increased attention in marketing and ot

does competition solve the hold up problem in an environment in which heterogeneous buyers and sellers undertake ex ante investments the presence of market competition for matches provides incentives for investment but may leave inefficiencies namely hold up and coordination problems this paper shows using an explicitly non cooperative model that when matching is assortative and investments precede market competition buyers investments are constrained efficient while sellers marginally underinvest with respect to what would be constrained efficient however the overall extent of this inefficiency may be large multiple equilibria may arise one equilibrium is characterized by efficient matches but there can be additional equilibria with coordination failures

a multiplicative fixed effects model of consumer choice the issue of consumer heterogeneity in discrete choice analysis has been attracting much attention recently research has suggested that heterogeneity can result in biased parameter estimates which in turn can lead to incorrect conclusions among the many methods proposed in the literature to handle heterogeneity fixed effects models seem to be the most attractive from a substantive point of view however in order to provide consistent estimates these models typically require long purchase histories this difficult constraint has prevented their widespread use in this paper we propose a new model which offers the benefits of fixed effects models without requiring long purchase histories our approach differs from the classic formulation in two ways first we calibrate the common and fixed effects sequentially rather than simultaneously this two stage estimation permits us to obtain unbiased estimates of the common parameters even when the sample has households with very few observations second we incorporate the fixed effects in a multiplicative rather than in an additive form our assumptions regarding the error term result in a probit model with heteroskedastic and temporally correlated random utilities we develop a method of moments based estimator to calibrate parameters of models with this type of error structure this procedure exploits the property that the method of moments yields estimates which are asymptotically as efficient as the maximum likelihood estimates given an appropriate starting point and a matrix of instruments this is a very general procedure in that its mechanics are not tied to the proposed model it can be readily applied to other problems where probit models are used to analyze data with serial correlation this is a methodological contribution of the paper the model and estimation procedure are illustrated on the a c nielsen scanner data base for the liquid detergent category our results indicate that the proposed model can provide a better fit than random effects and loyalty based models and better predictive performance than random effects models from a substantive perspective our analysis provides the following findings a the distribution of price sensitivities has a low variance thus most households have very similar price sensitivity in this category b the promotion response distribution has a high variance suggesting that there are some households that are highly responsive to promotions while there are quite a few households that are less influenced by promotions c preferences and price sensitivity have a negative covariance which is an indication that a reduction in preference for a brand is associated with an increase in price sensitivity and vice versa d preferences and promotion response have a positive covariance thus as the preference for a brand increases response to promotions by the brand also increases and e price sensitivity and promotion response have a negative covariance implying that as households become more price sensitive purchases may be driven more by price than by promotions in other words rather than responding to promotions such as displays and features as signals of a reduced price price sensitive households actively evaluate prices in arriving at a choice the proposed approach can be used by theoretical as well as applied researchers of brand choice behavior specifically estimates of fixed effects provided by the model can be used to cluster households into groups with similar parameters profiling the resulting groups in terms of demographics would provide interesting insights from a theoretical perspective regarding the household characteristics that are associated with different types of response behavior it would also help managers to better target their brands using the proposed approach for cross category analyses of fixed effects would be an interesting area of future research for instance given a sample of households and their purchase histories in multiple categories the proposed model can be used to explore the relationship between household behavior and category characteristics in particular issues such as the following can be investigated by comparing household level estimates across categories a are households that are highly price sensitive in one category also price sensitive in other categories b what household characteristics are associated with high low price sensitivity or high low promotion response across categories and c in what types of categories are households likely to exhibit high low price sensitivity or high low promotion response

a probit model of choice dynamics there are many products which are repeatedly purchased by consumers in such cases it is likely that choice history that is the sequence of choices made in the past as well as marketing variables affect subsequent choice decisions attempts to model the effects of choice history have been generally based on the inclusion of variables that represent brand loyalty and or variety seeking behavior in this paper we present a model of dynamic choice behavior which is more general and incorporates four characteristics the first characteristic labeled preference reinforcement and preference reduction represents loyalty and variety seeking the second is the short term reluctance of a consumer to move from the current brand inertia or the willingness to move to another brand mobility the third characteristic captures the effect of repetitive consumption the long term effect on inertia and mobility the fourth characteristic incorporates the similarity or dissimilarity of choice alternatives this is important in a dynamic model because choice on the current purchase occasion can be affected by whether a similar or dissimilar alternative was chosen on the previous occasion similarities of alternatives are represented in terms of distances the effect of price on choice behavior is also modeled individual level purchase data from a consumer panel are used to estimate a covariance probit and an independent probit specification of the model from a substantive perspective the model gives interesting insights into the dynamics of choice behavior the model predicts switches better than a benchmark model which incorporates only loyalty in addition it is superior to three benchmark models in overall predictive ability

sorting and long run inequality many social commentators have raised concerns over the possibility that increased sorting in society may lead to greater inequality to investigate this we construct a dynamic model of intergenerational education acquisition fertility and marital sorting and parameterize the steady state to match several basic empirical endings we end that increased sorting will signiecantly increase income inequality four factors are important to our endings a negative correlation between fertility and education a decreasing marginal effect of parental education on children s years of education wages that are sensitive to the relative supply of skilled workers and borrowing constraints that affect educational attainment for some low income households

stable marriages and search frictions stable matchings are the primary solution concept for two sided matching markets with nontransferable utility we investigate the strategic foundations of stability in a decentralized matching market towards this end we embed the standard marriage markets in a search model with random meetings we study the limit of steady state equilibria as exogenous frictions vanish the main result is that convergence of equilibrium matchings to stable matchings is guaranteed if and only if there is a unique stable matching in the underlying marriage market whenever there are multiple stable matchings sequences of equilibrium matchings converging to unstable inefficient matchings can be constructed thus vanishing frictions do not guarantee the stability and efficiency of decentralized marriage markets

a model of balanced choice behavior in some product categories consumers appear to alternate among items in a consistent and purposeful though not entirely deterministic fashion such alternation occurs even in the absence of any apparent external influences on choice to explain such balanced choice behavior we present a model based upon the premise that past consumption influences the utility of items on subsequent choice occasions individuals may seek variety on certain product attributes and exhibit loyalty toward others the model specification yields a logit choice model which may be calibrated using consumption diary panel data at the individual or cross sectional level

the division of labor coordination costs and knowledge this paper considers specialization and the division of labor a more extensive division of labor raises productivity because returns to the time spent on tasks are usually greater to workers who concentrate on a narrower range of skills the traditional discussion of the division of labor emphasizes the limitations to specialization imposed by the extent of the market we claim that the degree of specialization is more often determined by other considerations especially emphasized are various costs of coordinating specialized workers who perform complementary tasks and the amount of general knowledge available