global inequality how large is the effect of top incomes abstract despite the growing interest in global inequality assessing inequality trends is a major challenge because individual data on income or consumption is not often available nevertheless the periodic release of certain summary statistics of the income distribution has become increasingly common hence grouped data in form of income shares have been conventionally used to construct inequality trends based on lower bound approximations of inequality measures this approach introduces two potential sources of measurement error first these estimates are constructed under the assumption of equality of incomes within income shares second the highest income earners are not included in the household surveys from which grouped data is obtained in this paper we propose to deploy a flexible parametric model which addresses these two issues in order to obtain a reliable representation of the income distribution and accurate estimates of inequality measures this methodology is used to estimate the recent evolution of global interpersonal inequality from 1990 to 2015 and to examine the effect of survey under coverage of top incomes on the level and direction of global inequality overall we find that item non response at the top of the distribution substantially biases global inequality estimates but more importantly it might also affect the direction of the trends

returns to micro entrepreneurship in an emerging economy a quantile study of entrepreneurial indonesian households welfare presenting low individual returns but providing households with livelihoods and means to cope with economic vulnerability micro entrepreneurship s evaluation should include both context and heterogeneity using a four wave panel of 9 157 indonesian households this study proposes a quantile estimation of micro entrepreneurship s effects on four household level complementary measures of welfare income consumption household and total assets it evidences substantial positive but decreasing effects on the four measures with the highest relative returns for the poorest for this category micro entrepreneurship primarily provides returns in the form of income translating into higher relative consumption but more importantly into a greater relative assets accumulation

optimal dynamic pricing of inventories with stochastic demand over finite horizons in many industries managers face the problem of selling a given stock of items by a deadline we investigate the problem of dynamically pricing such inventories when demand is price sensitive and stochastic and the firm s objective is to maximize expected revenues examples that fit this framework include retailers selling fashion and seasonal goods and the travel and leisure industry which markets space such as seats on airline flights cabins on vacation cruises and rooms in hotels that become worthless if not sold by a specific time we formulate this problem using intensity control and obtain structural monotonicity results for the optimal intensity resp price as a function of the stock level and the length of the horizon for a particular exponential family of demand functions we find the optimal pricing policy in closed form for general demand functions we find an upper bound on the expected revenue based on analyzing the deterministic version of the problem and use this bound to prove that simple fixed price policies are asymptotically optimal as the volume of expected sales tends to infinity finally we extend our results to the case where demand is compound poisson only a finite number of prices is allowed the demand rate is time varying holding costs are incurred and cash flows are discounted the initial stock is a decision variable and reordering overbooking and random cancellations are allowed

analysis of seat allocation and overbooking decisions with hybrid information abstract we investigate a single leg airline revenue management problem where an airline has limited demand information and uncensored no show information to use such hybrid information for simultaneous overbooking and booking control decisions we combine expected overbooking cost with revenue then we take a robust optimization approach with a regret based criterion while the criterion is defined on a myriad of possible demand scenarios we show that only a small number of them are necessary to compute the objective we also prove that nested booking control policies are optimal among all deterministic ones we further develop an effective computational method to find the optimal policy and compare our policy to others proposed in the literature

the retirement behaviour of the self employed in britain we analyze the retirement behaviour of older self employed workers using a life cycle framework and a multinomial logit model of dynamic employment and retirement choices using data from the two wave retirement survey we find that greater actual or potential earnings decrease the probability of retirement among the self employed in contrast to employees none of gender health or family circumstances appear to affect self employed retirement decisions the dynamic analysis reveals that relatively few employees and virtually no retirees switch into self employment in later life the switches that do occur are motivated less by attempts to use self employment as a bridge job or stepping stone to full retirement than by self employment being a last resort for less affluent workers with job histories of weak attachment to the labour market we compare self employed and employee retirement behaviour and discuss the policy implications of our results

trends in unemployment duration data a method of estimating the distribution of uninterrupted unemploymentspells from aggregate unemployment data is outlined the methodology does not i mpose constant individual hazard rates and allows for heterogeneity characteris tics of the distribution of unemployment spells are then considered including ha zard rates measures of inequality such as gini coefficients and the fraction o f total unemployment associated with s weeks of unemploy ment the relationship between these char acteristics and labor demand variables gnp and supply side variables transfer payments unemployment insurance is considered in or der to better understand the relative role of short and long run unemployment copyright 1986 by mit press

market structure and the value of overselling under stochastic demands in the operations management literature traditional revenue management focused on pricing and capacity allocation strategies in a two period model with stochastic demand inspired by travel and lodging industries we examine a two period model in which each seller may also adopt the overselling strategy to customers whose valuations are differentiated by timing of arrivals widely seen as a popular hedge against consumers skipping reservations we extend the stylized approaches of biyalogorsky carmon fruchter and gerstner 1999 and lim 2009 to understand the value of overselling under various market structures we find that contrary to existing literature the impact of period two pricing competition from overselling spills over to period one such that overselling may not always be a weakly dominant strategy once unlimited early demand ceases to hold in a duopoly regime we provide some numerical studies on the existence of multiple equilibria at the capacity allocation level which actually lead to different selling strategies at the equilibrium despite identical market conditions and firm characteristics

globalization interregional and international inequalities abstract this paper examines the impact of globalization on interregional and international inequalities in a setup of two countries and four regions under international mobility of capital in contrast to the literature countries and regions are not required to be symmetric we find that the aforementioned inequalities are closely related to the country size region size the degree of globalization e g capital mobility and trade costs and the level of local infrastructure in particular international trade behaves as a dispersion force when capital is internationally mobile for small countries such that reducing domestic transport costs lowers its interregional inequality but the opposite can be true for large countries or when capital is internationally immobile

on the optimal pricing policy of a monopolist the paper presents a simple explanation of price dispersion by a monopolist assuming only that consumers arrive in a random order and are served on a first come first served basis a firm can sometimes increase its profits by charging two different prices for the same good and rationing sales at the lower price however it is never necessary to charge more than two prices and a single price is sufficient as long as either the marginal revenue curve is everywhere downward sloping or the marginal cost of production is constant

on analyzing the world distribution of income consideration of world inequality should cause reexamination of the key concepts underlying the welfare approach to measuring income inequality and its relation to measuring poverty this reexamination leads to exploration of a new measure that allows poverty and inequality to be considered in the same framework incorporates different approaches to measuring inequality and allows varied expressions of the cost of inequality applied to the world distribution of income for 1820 1992 the new measure provides different perspectives on the evolution of global inequality

the competitive newsboy we consider a competitive version of the classical newsboy problem in which a firm must choose an inventory or production level for a perishable good with random demand and the optimal solution is a fractile of the demand distribution and investigate the impact of competition upon industry inventory a splitting rule specifies how initial industry demand is allocated among competing firms and how any excess demand is allocated among firms with remaining inventory we examine the relation between equilibrium inventory levels and the splitting rule and provide conditions under which there is a unique equilibrium our most general result is that if all excess demand is reallocated i e there is perfect substitutability then competition never leads to a decrease in industry inventory

homeownership social capital and satisfaction with local government prior studies suggest that homeownership positively impacts on social capital formation however many studies find it difficult to control adequately for selection effects in the form of factors some of which may be unobserved that encourage both homeownership and investment in social capital by households a biennial survey conducted in new zealand cities provides data that enable the control of such selection effects with propensity score matching methods while also benchmarking the results by means of regression methods the results confirm that homeownership exerts positive impacts on the formation of social capital at the same time homeownership demands greater accountability of local government and leads to reduced satisfaction with local government performance thereby negatively impacting on community social capital hence these two dimensions of housing related social capital work in opposite directions from each other a finding which has not been previously observed

using yield management to shift demand when the peak time is unknown traditional peak load and stochastic peak load models assume firms have prior information about when peak demand occurs however price dispersion such as is typically used by firms practicing yield management can achieve some of the same efficient demand shifting even when the peak time is unknown equilibrium price dispersion arises because of stochastic demand and price rigidities but a previously unexplored benefit of price dispersion is its ability to reduce equilibrium capacity costs through demand shifting the model also suggests how yield management now more commonly called revenue management might actually benefit business travellers contrary to the popular prejudice

top incomes in the united states and canada over the twentieth century this paper presents top income shares series for the united states and canada over the 20th century in both countries top income shares display a u shaped pattern over the century with a precipitous drop during world war ii with no recovery in the following decades since the late 1970s however top income shares have been increasing dramatically and the very top shares are now almost as high as in the prewar era the drop in top income shares in the first part of the century is mainly a capital income phenomenon but the recent increase in top income shares is the consequence of a surge in top wages and salaries the united states reduced significantly marginal tax rates for high incomes over the last 40 years but canada did not therefore the almost identical upward pattern of top income shares in both countries cannot be solely explained by changes in tax avoidance behavior mobility at the top of the income distribution has been very stable in canada in spite of the surge in annual income concentration thus the increase in annual top income shares in northern america will likely translate into an increase in permanent income concentration of similar magnitude jel h24 h31 n32

measuring poverty in a growing world or measuring growth in a poor world the extent to which growth reduces global poverty has been disputed for 30 years although there are better data than ever before controversies are not resolved a major problem is that consumption measured from household surveys which is used to measure poverty grows less rapidly than consumption measured in national accounts in the world as a whole and in large countries particularly india china and the united states in consequence measured poverty has fallen less rapidly than appears warranted by measured growth in poor countries one plausible cause is that richer households are less likely to participate in surveys but growth in the national accounts is also upward biased and consumption in the national accounts contains large and rapidly growing items that are not consumed by the poor and not included in surveys so it is possible for consumption of the poor to grow less rapidly than national consumption without any increase in measured inequality current statistical procedures in poor

comparing the distribution of top incomes across countries comparing the distribution of top incomes across countries raises many methodological problems including differences in tax legislation and in tax avoidance the definition of the income unit and the definition of a control total for income the paper considers the significance of these problems in three applications comparing top income shares at a point in time analysing the extent of convergence or divergence over time and setting national changes in the context of the world distribution of income jel d31

the simultaneous evolution of growth and inequality research on inequality and growth can be divided into two strands one deriving from kuznets and lewis has tried to identify a mechanistic relationship between growth or level of income and inequality the other has tried to find causal explanations of growth and inequality treating each independently in this paper we draw from both strands to test whether growth and inequality are the joint outcomes of other variables and processes we find that simultaneous examination of growth and inequality yields significantly different results and has different consequences for policy from previous independent studies the empirical literature on growth and inequality can be divided into two broad strands one following the pioneering work of kuznets and lewis is motivated by the pessimistic conjecture that the process of growth and development somehow requires increasing inequality at least in the early stages this has led to many efforts to identify a mechanical relationship between the level of development and inequality anand and kanbur 1993 or to determine whether faster growth requires higher or lower inequality the second strand has sought to identify the causal factors influencing the evolution of growth and inequality independently this research has looked either at growth for example barro and sala i martin 1995 or at inequality li et al 1997 but has not tried to identify those factors that might simultaneously influence both growth and inequality 2 thus the literature that looks simultaneously at growth and inequality descending most notably from kuznets 1955 relates them in a mechanistic manner that ignores or minimises the role of other causal factors including policy while the literature that incorporates other causal factors including policies looks independently at growth and inequality neither approach is particularly convincing from a theoretical standpoint the evolution of growth and inequality must surely be the outcome of similar processes in addition neither approach is particularly useful for the policy maker who needs to balance the impact of policies on both growth and distribution in this paper we investigate whether growth and inequality are simultaneously determined and if so whether or not they are subject to

the developing world is poorer than we thought but no less successful in the fight against poverty a new data set on national poverty lines is combined with new price data and almost 700 household surveys to estimate absolute poverty measures for the developing world we find that 25 of the population lived in poverty in 2005 as judged by what poverty typically means in the world s poorest countries this is higher than past estimates substantial overall progress is still indicated the corresponding poverty rate was 52 in 1981 but progress was very uneven across regions the trends over time and regional profile are robust to various changes in methodology though precise counts are more sensitive

an economic approach to social capital a standard optimal investment model can be used to analyse an individual s decision to accumulate social capital we analyse six facts that support the predictions of this individual based approach 1 social capital first rises and then falls with age 2 social capital declines with expected mobility 3 social capital rises in occupations with greater returns to social skills 4 social capital is higher among homeowners 5 social connections fall sharply with physical distance 6 people who invest in human capital also invest in social capital we fail to find robust evidence that social capital investments fall with the value of time or that geographic religious groups generate social capital complementarities

global income distributions and inequality 1993 and 2000 incorporating country level inequality modeled with beta distributions abstract using a method of moments estimator flexible three parameter beta distributions are fitted to aggregate country level income data to overcome an untenable assumption of previous studies that persons within each income group receive the same income regional and global income distributions are derived as weighted mixtures of country specific distributions analytical expressions for gini and theil s measures of inequality at country regional and global levels are derived in terms of the parameters of the beta distributions application to data for 91 countries in 1993 and 2000 reveals a high degree of global inequality with evidence of declining inequality largely attributable to growth in china

the distribution of personal income revisited in a recent paper majumder and chakravarty 1990 propose a four parameter model which they find provides a better fit to some income data than the lognormal gamma singh maddala dagum and generalized beta of the second kind gb2 distributions this note 1 demonstrates that the model proposed by majumder and chakravarty is a reparameterization of the gb2 and 2 reconciles the corresponding contradictory empirical findings reported by majumder and chakravarty

targeting the poor in mexico an evaluation of the selection of households into progresa abstract in this paper we conduct an evaluation of the targeting method used by health education and nutrition program progresa of mexico to identify beneficiary households we address two key questions a how well does progresa s targeting perform and b how does the program perform in terms of its impact on poverty alleviation relative to other feasible methods and transfer schemes the first question is accomplished by comparing progresa s method to an alternative selection method based on household consumption which is our preferred measure of welfare we employ the concepts of undercoverage and leakage and find that progresa selection method is more effective in identifying the extremely poor localities or households but less so when it comes to distinguishing among localities or households in the middle of the scale to address the second question we compare the potential impact of progresa on poverty alleviation against uniform transfers that involve no targeting at all targeting based on consumption and geographic targeting i e targeting at the locality level rather than at the household level we find that progresa s method of targeting households outperforms uniform coverage and targeting at the locality level in terms of reducing the poverty gap and severity of poverty indices even after taking into account the economic costs of targeting but the closeness of progresa s performance to what could be achieved by geographic targeting alone raises some serious questions about the costs and benefits associated with the practice of household targeting within poor localities

a new data set measuring income inequality this article presents a new data set on inequality in the distribution of income the authors explain the criteria they applied in selecting data on gini coefficients and on individual quintile groups income shares comparison of the new data set with existing compilations reveals that the data assembled here represent an improvement in quality and a significant expansion in coverage although differences in the definition of the underlying data might still affect inter temporal and international comparability based on this new data set the authors do not find a systematic link between growth and changes in aggregate inequality they do find a strong positive relationship between growth and reduction of poverty

collusive pricing with capacity constraints in the presence of demand uncertainty we explore the response of collusive prices to changing demand conditions when firms operate under capacity constraints in the presence of demand uncertainty we find support for the conventional view that periods of low demand lead through the emergence of excess capacity to a breakdown of collusive pricing we also find that the nature of price wars depends on the degree of excess capacity in the industry while small amounts of excess capacity can lead firms to engage in mild price wars characterized by uniform price reductions and market share stability more severe price wars characterized by price undercutting and market share instability can emerge if excess capacity is sufficiently great finally our results lend support to the view that market share instability is a symptom of ineffective collusion

levels and long term trends in earnings inequality overcoming current population survey censoring problems using the gb2 distribution over its history the march current population survey cps has increasingly captured the upper tail of the distribution of all sources of income this together with time consistency problems in top coding means that users of both the public use and restricted access cps will understate the level of wage earnings and income inequality in earlier years and overstate their growth over time we address this problem by modeling the personal earnings of full time full year workers using the generalized beta distribution of the second kind calculating gini coefficients from the estimated parameters and comparing them with past findings

who skims the cream of the italian graduate crop wage employment versus self employment this paper tests whether academic achievement is a significant determinant of employment status in the italian labor market are new entrepreneurs selected from the top or bottom end of the graduate ability distribution is the cream of the graduate crop pulled into self employment by the higher expected earnings or are individuals with lower degree score pushed into entrepreneurship by poor alternatives our data show a strong negative relation between academic achievement and self employment status i e we find skimming of the best graduates into wage and salary work

modelling entrepreneurship unifying the equilibrium and entry exit approach two approaches can be distinguished with respect to modelling entrepreneurship i the approach focusing on the net development of the number of entrepreneurs in an equilibrium framework and ii the approach focusing on the entries and exits of entrepreneurs in this paper we unify these approaches to arrive at a model explaining the equilibrium and actual number of entrepreneurs and the entry and exit rate of entrepreneurs simultaneously and consistently we apply our unified approach to the netherlands using self employment data for the 1960 1999 period we find error correction of about 20 per year and a very different situation in terms of disequilibrium before and after the early 1980s periods of high unemployment appear to be characterized by both high entry and high exit rates

on the determinants of slum formation we construct a simple model of a city with heterogeneous agents and housing choice to explain the determinants of slums home to about one third of the urban population in developing countries the model supports the main empirical evidence regarding slum formation and is able quantitatively to assess the role of each determinant of slum growth we show that urban poverty inequality and rural urban migration explain much of the variation in slum growth in brazil from 1980 to 2000 ex ante evaluation of the impacts of policy interventions shows that removing barriers to formalisation has a strong impact on slum reduction

learning about the unknown how fast do entrepreneurs adjust their beliefs this paper seeks to measure the extent to which entrepreneurs adjust their beliefs in the light of new information instead of relying on past experience to guide their decision making we build a model in which entrepreneurs continually receive valuable but noisy market signals about the true but unobserved productivity of their effort and use this information to update their expectations of unobserved productivity the model is estimated using a sample of over 700 self employed britons interviewed in 1999 and 2000 it is found that on average these individuals adjust their expectations of unobserved productivity in the light of new information by only 16 this suggests that while entrepreneurs do exploit new information they give much greater weight to their prior beliefs when forming their expectations also there are no significant differences in terms of expectation formation between males and females employers and non employers and experienced and less experienced entrepreneurs however younger entrepreneurs respond significantly more sensitively to new information than older entrepreneurs do with adjustment rates of 21 compared with 14 respectively we go on to discuss some policy implications of these findings and briefly discuss several features of entrepreneurship education programs that might help entrepreneurs improve this aspect of their business performance

spatial variations in personal insolvency choices the role of stigma and social capital this article offers an explanation for the wide spatial variations in choice of insolvency route by personal debtors across local authorities in england and wales it is argued that formal bankrupt

the world distribution of income falling poverty and convergence period we estimate the world distribution of income by integrating individual income distributions for 138 countries between 1970 and 2000 country distributions are constructed by combining national accounts gdp per capita to anchor the mean with survey data to pin down the dispersion poverty rates and head counts are reported for four specific poverty lines rates in 2000 were between one third and one half of what they were in 1970 for all four lines there were between 250 and 500 million fewer poor in 2000 than in 1970 we estimate eight indexes of income inequality implied by our world distribution of income all of them show reductions in global inequality during the 1980s and 1990s

what do we know about global income inequality in this paper we review the recent literature on global interpersonal income inequality while all estimates agree that the level is very high with a gini of between 0 630 and 0 686 in the 1990s there is no consensus regarding the direction of change we discuss methodological issues including the use of national accounts versus survey based estimates of mean income or consumption and the choice of purchasing power parity exchange rates findings of a rise or fall in global income inequality are not robust across different estimation methods and datasets given the diversity of estimates and various sources of uncertainty including gaps and errors in the underlying data we conclude there is insufficient evidence to determine the direction of change in global interpersonal inequality in recent decades

optimal pricing with speculators and strategic consumers this paper studies a monopolist firm selling a fixed capacity the firm sets a price before demand uncertainty is resolved speculators may enter the market purely with the intention of resale which can be profitable if demand turns out to be high consumers may strategically choose when to purchase and they may also choose to purchase from the firm or from the speculators we characterize equilibrium prices and profits and analyze the long run capacity decisions of the firm there are three major findings first the presence of speculators increases the firm s expected profits even though the resale market competes with the firm second by facilitating resale the firm can mimic dynamic pricing outcomes and enjoy the associated benefits while charging a fixed price third speculative behavior may generate incentives for the seller to artificially restrict supply and thus may lead to lower capacity investments we also explore several model extensions that highlight the robustness of our results

entrepreneurial learning and the existence of credit markets abstract i explore the economic implications of learning by doing by borrower entrepreneurs who are initially imperfectly informed about their innate abilities it is shown how entrepreneurial learning worsens the adverse effects of moral hazard causing the possible disappearance of otherwise viable credit markets and thereby decreasing social welfare the reason is that learning reduces subjective uncertainty about risky future outcomes thus encouraging excessive risk taking behaviour

the evolution of top incomes in an egalitarian society sweden 1903 2004 this study presents new homogenous series of top income shares in sweden over the period 1903 2004 we find that starting from levels of inequality approximately equal to those in other western countries at the time the income share of the swedish top decile drops sharply over the first eighty years of the twentieth century most of the decrease takes place before the expansion of the welfare state and by 1950 swedish top income shares were already lower than in other countries the fall is almost entirely due to a dramatic drop in the top percentile explained mostly by decreases in capital income while the lower half of the top decile consisting mainly of wage earners experiences virtually no change over this period in the past decades top income shares evolve very differently depending on whether capital gains are included or not when included sweden s experience resembles that in the u s and the u k with sharp increases in top incomes excluding capital gains sweden looks more like the continental european countries where top income shares have remained relatively constant a possible interpretation of our results is that sweden over the past 20 years has become a country where it is more important to make the right financial investments than to earn a lot to become rich

competitive promotional strategies this article analyzes the equilibrium pricing strategies of brands engaged in a pricing game each brand has a monopoly market loyal consumers and competes with others in a common market called brand switchers in the case of a duopoly it is shown that the behavior of the brand switchers characterizes the equilibrium behavior of the duopolists this article focuses on two key comparative statics namely the depth of discounts away from a regular high price and the probability of giving a deal or the frequency of deals how these properties vary with the size of the loyal markets and the behavior of the brand switching population is discussed copyright 1988 by the university of chicago

combined pricing and inventory control under uncertainty this paper addresses the simultaneous determination of pricing and inventory replenishment strategies in the face of demand uncertainty more specifically we analyze the following single item periodic review model demands in consecutive periods are independent but their distributions depend on the item s price in accordance with general stochastic demand functions the price charged in any given period can be specified dynamically as a function of the state of the system a replenishment order may be placed at the beginning of some or all of the periods stockouts are fully backlogged we address both finite and infinite horizon models with the objective of maximizing total expected discounted profit or its time average value assuming that prices can either be adjusted arbitrarily upward or downward or that they can only be decreased we characterize the structure of an optimal combined pricing and inventory strategy for all of the above types of models we also develop an efficient value iteration method to compute these optimal strategies finally we report on an extensive numerical study that characterizes various qualitative properties of the optimal strategies and corresponding optimal profit values

overselling in a competitive environment boon or bane in this paper we study the practice of overselling in a competitive environment where late arriving consumers value the good higher than early arriving ones but the former s arrival is uncertain we show that overselling is a dominant strategy for the firms however it can lead to a prisoners dilemma situation in which all firms are worse off overselling we further show that only when demand from the late consumers far exceeds the supply and there is a sufficiently high profit margin from reselling does overselling result in a pareto dominant outcome for the firms

top incomes in the long run of history a recent literature has constructed top income shares time series over the long run for more than twenty countries using income tax statistics top incomes represent a small share of the population but a very significant share of total income and total taxes paid hence aggregate economic growth per capita and gini inequality indexes are sensitive to excluding or including top incomes we discuss the estimation methods and issues that arise when constructing top income share series including income definition and comparability over time and across countries tax avoidance and tax evasion we provide a summary of the key empirical findings most countries experience a dramatic drop in top income shares in the first part of the twentieth century in general due to shocks to top capital incomes during the wars and depression shocks top income shares do not recover in the immediate postwar decades however over the last thirty years top income shares have increased substantially in english speaking countries and in india and china but not in continental european countries or japan this increase is due in part to an unprecedented surge in top wage incomes as a result wage income comprises a larger fraction of top incomes than in the past finally we discuss the theoretical and empirical models that have been proposed to account for the facts and the main questions that remain open

optimal service speeds in a competitive environment this is a study of the economic behavior of vendors of service in competition a simple model with two competing exponential servers and poisson arrivals is considered each server is free to choose his own service rate at a cost per time unit that is strictly convex and increasing there is a fixed reward to a server for each customer that he serves the model is designed to study one specific aspect of competition namely competition in speed of service as a means for capturing a larger market share in order to maximize long run expected profit per time unit a two person strategic game is formulated and its solutions are characterized depending on the revenue per customer served and on the cost of maintaining service rates the following three situations may arise i a unique symmetric strategic nash equilibrium in which expected waiting time is infinite ii a unique symmetric strategic equilibrium in which expected waiting time is finite and iii several nonsymmetric strategic equilibria with infinite expected waiting time an explicit expression for the market share of each server as a function of the service rates of the two servers is also given

dynamic pricing in the presence of inventory considerations research overview current practices and future directions the benefits of dynamic pricing methods have long been known in industries such as airlines hotels and electric utilities where the capacity is fixed in the short term and perishable in recent years there has been an increasing adoption of dynamic pricing policies in retail and other industries where the sellers have the ability to store inventory three factors contributed to this phenomenon 1 the increased availability of demand data 2 the ease of changing prices due to new technologies and 3 the availability of decision support tools for analyzing demand data and for dynamic pricing this paper constitutes a review of the literature and current practices in dynamic pricing given its applicability in most markets and its increasing adoption in practice our focus is on dynamic intertemporal pricing in the presence of inventory considerations

in defense of inequality this is a perfect time to discuss inequality after a period of three decades when wage inequality among men in the united states grew to approximate pre world war ii levels measured inequality apparently has stabilized and may in fact be decreasing claudia goldin and robert a margo 1992 it is therefore a good time to assess the changes to compare the gains and losses i choose this topic not to offend but because i believe inequality is an economic good that has received too much bad press i also think you will agree that it is a good which like any other can be scarce or overly abundant i am neither trying to praise nor defend poverty and i hope it is understood that the link between wages and income is not especially close particularly at lower incomes where nonemployment dominates wages play many roles in our economy along with time worked they determine labor income but they also signal relative scarcity and abundance and with malleable skills wages provide incentives to render the services that are most highly valued further we all buy and sell labor either directly or indirectly as labor is embodied in products to reverse one of the themes of milton friedman s introductory theory class one man s poison can be another s meat together with rising relative wages the post 1950 increase in the job market employment of women is one of our major accomplishments but it is an accomplishment that has been fueled in part by the low wages earned by those the census classifies as private household workers childcare workers workers in laundries and cleaning establishments food service workers etc as the population ages the prospect of increasing dependence on personal assistance looms for the most part personal assistants and aides earn low wages wages that extend the services we can afford friedman s actual observation is however that one man s meat is not necessarily another s poison friedman 1976 the relatively high wages earned by physicians scientists and university professors have attracted many immigrants to the united states would we be better off if they had not immigrated we could in fact reduce wage inequality by simply proscribing immigration because the wage distribution of immigrants is u shaped relative to that of natives see j p smith and b edmonston 1997 p 180 table 5 4 my guess is that most economists faced with such an option would respond by directing attention to the services immigrants provide my objective is to examine the recent period of increasing wage inequality with an eye toward the positive i describe some of the changes that have occurred speculate about the causes and wrap up with illustrations of consequences i contend that growing inequality has created opportunities that have been exploited by many and that the gains are not restricted to the traditional elite moreover when we have adopted policies to mitigate the downside of increasing inequality which is falling real wages in the lower parts of the distribution a surprising number of individuals have also capitalized on those opportunities in ways that are not productive before turning to the data i want to make a few general observations department of economics texas a m university college station tx 77843 4228 i am indebted to martin gritsch for assistance in extracting the data and to barbara charlton for secretarial support i am also indebted to participants in the ucla rand labor workshop and especially to janet currie and james p smith for comments and suggestions on an earlier draft i have drawn heavily on my previous work much of it in collaboration with kevin m murphy

top incomes in the netherlands and the united kingdom over the 20th century a method is developed for using income tax data to investigate the evolution of the highest incomes over virtually the entire 20th century the income shares of the top 10 5 1 0 5 0 1 and 0 05 percent are analysed for the uk and the netherlands for considering the top shares among themselves the pareto lorenz coefficient is proposed between the two countries the top shares appear to undergo a strikingly similar and strong decline up to the mid 1970s since then british top shares have increased significantly while dutch shares remained basically unchanged this outcome parallels similar results for the us and france obtained by piketty and saez and poses interesting questions for research jel n34 d31 o15

long term trends in earnings inequality what the cps can tell us abstract changes in current population survey cps topcoding rules in the 1990s artificially increased measured earnings inequality we create a time consistent cps data series and compare trends in earnings inequality from 1975 to 2001

how closely do top income shares track other measures of inequality in recent years researchers have used taxation statistics to estimate the share of total income held by the richest groups such as the top 10 or the top 1 compiling a standardised top income shares dataset for 13 developed countries i find that there is a strong and significant relationship between top income shares and broader inequality measures such as the gini coefficient this suggests that panel data on top income shares may be a useful substitute for other measures of inequality over periods when alternative income distribution measures are of low quality or unavailable

the distribution of self employment income in the united kingdom 1976 1991 this paper examines the pattern of uk self employment income inequality between 1976 and 1991 and develops a simple model of the size distribution inequality measures are related to the parameters of this distribution whose economic determinants are explained it is found that the principal cause of rising self employment income inequality over this period was a substantial increase in the heterogeneity of the self employed themselves in contrast the increased numbers engaged in self employment over the period seems to have had no discernible effect on inequality via the parameters of the self employment income distribution

the generalised beta as a model for the distribution of earnings abstract we present a neoclassical model of optimising firm behaviour which predicts the earnings distribution to follow the flexible and well known generalised beta distribution of the second kind

a taxonomy and research overview of perishable asset revenue management yield management overbooking and pricing this paper proposes the term perishable asset revenue management to denote the field that combines the areas of yield management overbooking and pricing for perishable assets after summarizing the characteristics common to problems in this field the paper discusses the objectives and constraints faced by decision makers then it offers a comprehensive taxonomy with 14 different elements and reviews the research that has been done related to each element finally it suggests some important areas of future research that can help bridge the gap between theory and application

u s wage inequality trends and recent immigration how should we assess the changing economic status of workers and families in the united states the answer is obvious to many including outstanding economists who decry the meager wage growth and rising wage and income inequality in the united states since 1979 paul krugman 1992 richard freeman 1996 1997 james tobin 1996 1997 according to freeman 1996 1997 the following facts are not in dispute

price versus production postponement capacity and competition this article presents a comparative analysis of possible postponement strategies in a two stage decision model where firms make three decisions capacity investment production inventory quantity and price typically investments are made while the demand curve is uncertain the strategies differ in the timing of the operational decisions relative to the realization of uncertainty we show how competition uncertainty and the timing of operational decisions influence the strategic investment decision of the firm and its value in contrast to production postponement price postponement makes the investment and production inventory decisions relatively insensitive to uncertainty this suggests that managers can make optimal capacity decisions by deterministic reasoning if they have some price flexibility under price postponement additional postponement of production has relatively small incremental value therefore it may be worthwhile to consider flexible ex post pricing before production postponement reengineering while more postponement increases firm value it is counterintuitive that this also makes the optimal capacity decision more sensitive to uncertainty we highlight the different impact of more timely information which leads to higher investment and inventories and of reduced demand uncertainty which decreases investment and inventories our analysis suggests appropriateness conditions for simple make to stock and make to order strategies we also present technical sufficiency and uniqueness conditions under price postponement these results extend to oligopolistic and perfect competition for which pure equilibria are derived interestingly the relative value of operational postponement techniques seems to increase as the industry becomes more competitive

using the pareto distribution to improve estimates of topcoded earnings i introduction the public use march current population survey cps is the primary source of data for tracking levels and trends in u s labor earnings and for understanding the factors which influence these trends literatures that have used cps earnings data are vast and include research on the changing returns to education or college major in the labor market autor 2014 gemici and wiswall 2014 earnings differentials across occupations glied ma and pearlstein 2015 earnings volatility hardy and ziliak 2014 elasticity of taxable income burns and ziliak forthcoming and more generally the causes of changes in wage structures and earnings inequality see e g autor katz and kearney 2008 card and dinardo 2002 goldin and katz 2007 juhn murphy and pierce 1993 acemoglu 2002 altonji and blank 1999 and katz and autor 1999 provide reviews of this literature however these literatures that use the public use cps data have been hampered by an attenuated view of the right tail of the labor earnings distribution due to the topcoding of high earnings in the public use cps data 1 importantly the failure to properly correct for inconsistent topcoding has been found to result in biased estimates for a range of outcomes including returns to education hubbard 2011 the size of the earnings gaps between gender and race groups burkhauser and larrimore 2009a the relative economic resources of individuals with and without disabilities burkhauser and larrimore 2009b and population level income inequality burkhauser et al 2012 to correct for topcoding biases public use cps based researchers have generally pursued one of four paths 1 ignoring the topcoding problem 2 making an ad hoc adjustment to topcoded earnings values 3 using a pareto distribution to estimate earnings at the top of the distribution or 4 using cell means or rank proximity swapped data that is based on the still censored internal cps data for example a common ad hoc technique based on estimates from pareto imputations of top earnings is to replace topcoded earnings with a multiple of the topcode threshold so all individuals with topcoded earnings in a year are assumed to have earnings at 1 3 1 4 or 1 5 times the topcode threshold autor katz and kearney 2008 juhn murphy and pierce 1993 katz and murphy 1992 lemieux 2006 however such an approach may misstate top earnings if the wrong multiple is used or if the appropriate multiple changes over time similarly researchers using a pareto imputation of top earnings may misstate those earnings if they are unable to obtain a reasonable fit for the pareto distribution when using available public use data making use of internal march cps files with their much higher censoring levels we show that previous ad hoc estimates and pareto estimations of top earnings based on public use data understate mean earnings at the top of the earnings distribution and hence also understate earnings inequality however as this internal data are also censored albeit at higher levels any results based purely on the internal data will also fail to capture a portion of the income at the very top of the distribution and therefore will also understate inequality hence while cell means based on internal data such as those produced by larrimore et al 2008 and the rank proximity swapped data series which the census began providing in 2010 each allow researchers to replicate results from the internal census data findings using these series will be subject to the same limitations and understatement of true top incomes as the internal values recognizing the limitations of the existing options to correct for topcoding we proceed by using a continuous maximum likelihood estimator along with internal cps data to produce a series of more accurate estimates of top earnings in the cps data our estimates start with actual top earnings from the internal cps combined with a pareto estimate using these data for internally censored observations

research note overselling with opportunistic cancellations in many business sectors such as airlines hotels trucking and media advertising customers arrivals and willingness to pay are uncertain managers must decide whether to quote a price low enough to guarantee early sales or to quote a higher price and risk that some units remain unsold in allocating capacity they face a trade off between two types of potential losses 1 yield loss selling at a low price and losing a better price later and 2 spoilage loss waiting in vain to sell at a high price and losing the opportunity of an earlier low price offer yield loss means that consumers who value the product most do not get to use it and spoilage loss means that valuable products are wasted because no consumers get to use them sellers typically hedge against the risk of spoilage loss by selling some units early at low prices and against the risk of yield loss by blocking some units in hope of selling them later at a high price in this paper we show that the use of overselling with opportunistic cancellations can increase expected profits and improve allocation efficiency under this strategy the seller deliberately oversells capacity if high paying consumers show up even when capacity is already fully booked the seller then cancels the sale to some low paying customers while providing them with appropriate compensation we derive a new rule to optimally allocate capacity to consumers when overselling is used and show that overselling helps limit the potential yield and spoilage losses yield loss is reduced because the seller can capture more high paying customers by compensating low paying customers who give up their right to the product spoilage loss is reduced because the compensation decreases the price spread perceived by the seller and as a result the seller is less anxious to speculate and block units overselling with opportunistic cancellations assures that the product will be sold to consumers who value it most this means that everybody wins and resources are allocated more efficiently than in conventional selling

why do mexican americans earn low wages using current population survey data from november 1979 and 1989 i find that mexican americans earn low wages primarily because they possess less human capital than other workers not because they

recent trends in top income shares in the usa reconciling estimates from march cps and irs tax return data although the majority of research on us income inequality trends is based on public use march cps data a new wave of research using irs tax return data reports substantially higher levels of inequality and faster growing trends we show that these apparently inconsistent estimates are largely reconciled if the inequality measure and the income distribution are defined in the same way using internal cps data for 1967 2006 we closely match irs data based estimates of top income shares reported by piketty and saez 2003 our results imply that any inequality increases since 1993 are concentrated among the top 1 percent of the distribution

global income distribution from the fall of the berlin wall to the great recession we present an improved panel database of national household surveys between 1988 and 2008 in 2008 the global gini index is around 70 5 having declined by approximately 2 gini points china graduated from the bottom ranks changing a twin peaked global income distribution to a single peaked one and creating an important global median class 90 of the fastest growing country deciles are from asia while almost 90 of the worst performers are from mature economies another winner was the global top 1 hence the global growth incidence curve has a distinct supine s shape with gains highest around the median and top

truncation bias and the measurement of income inequality 1988 truncation bias and the measurement of income inequality journal of business economic statistics vol 6 no 3 pp 335 337

revenue management under customer choice behaviour with cancellations and overbooking abstract in many application areas such as airlines and hotels a large number of bookings are typically cancelled explicitly taking into account cancellations creates an opportunity for increasing revenue motivated by this we propose a revenue management model based on talluri and van ryzin 2004 that takes cancellations into account in addition to customer choice behaviour moreover we consider overbooking limits as these are influenced by cancellations we model the problem as a markov decision process and propose three dynamic programming formulations to solve the problem each appropriate in a different setting we show that in certain settings the problem can be solved exactly using a tractable solution method for other settings we propose tractable heuristics since the problem faces the curse of dimensionality numerical results show that the heuristics perform almost as good as the exact solution however the model without cancellations can lead to a revenue loss of up to 20 percent lastly we provide a parameter estimation method based on newman et al 2014 this estimation method is fast and provides good parameter estimates the combination of the model the tractable and well performing solution methods and the parameter estimation method ensures that the model can efficiently be applied in practice

inequality among world citizens 1820 1992 this paper investigates the distribution of well being among world citizens during the last two centuries the estimates show that inequality of world distribution of income worsened from the beginning of the 19th century to world war ii and after that seems to have stabilized or to have grown more slowly in the early 19th century most inequality was due to differences within countries later it was due to differences between countries inequality in longevity also increased during the 19th century but then was reversed in the second half of the 20th century perhaps mitigating the failure of income inequality to improve in the last decades jel d31 f0 n0 o0

the optimal linear taxation of employment and self employment incomes abstract this paper models optimal linear taxation when occupational choice and labour supply are endogenous workers choose between paid employment self employment and unemployment self employment incomes are risky and employees may be involuntarily laid off calibrating the model to the uk economy the optimal tax solution involves relatively high taxation with substantial redistribution and a higher nominal but not effective marginal tax rate imposed on the self employed than on employees the implications of making unemployment benefits as well as tax rates endogenous are also analysed and robustness checks are performed