a generalization of the endogenous grid method abstract this paper extends carroll s 2005 the method of endogenous gridpoints for solving dynamic stochastic optimization problems national bureau of economic research technical working paper 309 endogenous grid method to perform value function iteration in models with more than one control variable we propose to mix the endogenous grid method with standard value function iteration to achieve higher efficiency we illustrate the method using the stochastic neoclassical growth model with and without labor leisure choice we report important gains in efficiency that make value function iteration an attractive computational method in terms of both computing time and accuracy

a re examination of the relationship between industry structure and economic performance the objective of this study is to develop a simultaneous equations model of profitability concentration advertising expenditures and research and development outlays the data used in the estimation are subjected to regression diagnostics in an effort to determine the importance to the estimation results of a subset of the data that can have a disproportionate influence the estimation results especially for the advertising expenditures relationship and the research and development outlays equation do change when a truncated data sample based on the omission of the outliers is used this serves partly to explain why there is some disagreement in the literature on market structure and economic performance with regard to the impact of several economic factors

taxes benefits and careers complete versus incomplete markets abstract an incomplete market life cycle model with indivisible labor makes career lengths and human capital accumulation respond to labor tax rates and government supplied non employment benefits we compare aggregate and individual outcomes in this individualistic incomplete market model with those in a comparable collectivist representative family model with employment lotteries and complete insurance markets the incomplete and complete market structures assign leisure to different types of individuals who are distinguished by their human capital and age these microeconomic differences distinguish the two models in terms of how macroeconomic aggregates respond to some types of government supplied non employment benefits but remarkably not to labor tax changes

optimal capital income taxation with incomplete markets borrowing constraints and constant discounting for a wide class of infinitely lived agent models chamley has shown that the optimal capital income tax rate is zero in the long run lucas has argued that for the u s economy there is a significant welfare gain from switching to this policy this paper shows that for the bewley class of models with incomplete insurance markets and borrowing constraints the optimal tax rate on capital income is positive even in the long run therefore cutting the capital income tax to zero may well lead to welfare losses

discrete equilibrium price dispersion an explicit solution of an equilibrium model with price setting firms and searching customers makes possible a number of comparativestatics predictions about how cost differences among firms search costs of customers and taxes will affect the mean and variance of the distribution of market prices another implication of the model is that a firm s demand depends on the difference between its price and the average price in the market

a simultaneous equation analysis of advertising concentration and profitability nearly two decades of econometric research have been completed in testing relationships between industrial market structure and performance recently a number of authors have reexamined these studies and cautioned on a number of conceptual difficulties which subject the results and interpretation of previous empirical work to question one primary criticism of previous research has been the failure to account for the simultaneous nature of the interrelation among elements of industry structure conduct and performance 2 4 5 11 22 25 30 while the determinants of variables such as profits advertising and concentration have been examined separately within the context of single equation models the underlying theory suggests that these variables are more properly considered as jointly determined within a system of simultaneous equations estimation of single equation models when a simultaneous system is appropriate leads to parameter estimates that are both biased and inconsistent previous empirical studies of the structure performance relationship have also suffered due to the omission of certain critical variables first the role of international trade as an element of market structure has yet to be generally incorporated into empirical studies in spite of recent theoretical work that has demonstrated its potential importance 3 20 21 second interindustry differentials in the price elasticity of demand have been neglected even though theoretical analysis clearly underscores the necessity of explicity accounting for

targeted transfers and the fiscal response to the great recession abstract between 2007 and 2009 government expenditures increased rapidly across the oecd countries while economic research on the impact of government purchases has flourished in the data most of the increase in expenditures was in government transfers after documenting this fact we argue that future research should focus on the positive impact of transfers towards this we present a model in which there is no representative agent and ricardian equivalence does not hold because of uncertainty imperfect credit markets and nominal rigidities targeted lump sum transfers are expansionary both because of a neoclassical wealth effect and because of a keynesian aggregate demand effect

bureaucratic capacity delegation and political reform thecentraltensionmotivatingcontemporarytheories of delegation from politicians to bureaucrats lies in the potential conflict between the value of bureaucratic expertise on one hand and the desire for political control on the other this tension is well known and has been debated at least since weber s classic work on bureaucracy modern bureaucracies are staffed with individuals who by virtue of rational bureaucratic organization are highly skilled policy experts who in principle should be able to help less knowledgeable politicians achieve their goals however the very skills and expertise that bureaucrats enjoy create the possibility that bureaucrats will usurp the rightful role of politicians in policymaking processes because the way this tension is resolved determines the ultimate compatibility of democracy and bureaucracy existing theories of delegation typically focus on understanding how and to what extent politicians can resolve it 1 in many contexts particularly developing democracies bureaucracy does not fit the weberian characteristics that are assumed in the existing delegation literature the bureaucracies may be staffed with individuals who lack the personal capacity to execute orders effectively the organizational structure may lead to breakdowns within bureaucratic hierarchies making it difficult for senior administrators to control their subordinates departments and ministries may lack basic budgets and resources to undertake implementation actions they may suffer from incentives for

wage and price controls in the equilibrium sequential search model abstract in this paper we study the effects of wage and price controls on employment output and welfare in a simplified version of the benabou j econom theory 60 1993 140 equilibrium sequential search model with bilateral heterogeneity we show that a price ceiling increases output but the change in welfare depends on three effects the reduction in aggregate search costs the increase in surplus due to increased output and the transfer of production to the least efficient firm the model is formally identical to a standard equilibrium search model of the labor market so analogous results hold for the minimum wage

the optimum quantity of debt abstract we find that the welfare gains to being at the optimum quantity of debt rather than the current us level are small and therefore concerns regarding the high level of debt in the us economy may be misplaced this finding is based on a model of a large number of infinitely lived households whose saving behavior is influenced by precautionary saving motives and borrowing constraints this model incorporates a different role for government debt than is found in standard models and it captures different cost benefit trade offs on the benefit side government debt enhances the liquidity of households by providing an additional means of smoothing consumption and by effectively loosening borrowing constraints on the cost side the implied taxes have adverse wealth distribution and incentive effects in addition government debt crowds out capital via higher interest rates and lowers per capita consumption

learning in an equilibrium search model this paper explores the role of learning in an equilibrium search model with asymmetric information firms with identical but privately observed marginal cost sell a homogeneous good to heterogeneously informed consumers a reservation price equilibrium exists if the uninformed consumers search cost is sufficiently large in this equilibrium the amount of price dispersion is inversely related to the realization of marginal cost also the average price level is less responsive to cost changes than when cost is observable finally uncertainty about firms marginal cost increases the expected price level copyright 1994 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

measuring advertising intensity and intangible capital in the greek food industry the objective of the present paper is to examine market conduct and its determinants in the greek food industry and to measure how and to what degree the industry and the firm s structural characteristics affect advertising intensity an advertising intensity model giving emphasis to intangible capital is formulated data from icap have been used on a four digit classification for the food industry during the 1990 1997 period the empirical results indicate that intangible capital positively affects the advertising intensity of the firm and plays an important role in strategies that affect total cost demand and structure of the market

an empirical model of labor supply in a life cycle setting this paper formulates and estimates a structural intertemporal model of labor supply using theoretical characterizations derived from an economic model of lifetime behavior a two step empirical analysis yields estimates of intertemporal and uncompensated substitution effects which provide the information needed to predict the response of hours of work to life cycle wage growth and shifts in the lifetime wage path

heterogeneity and government revenues higher taxes at the top abstract how effective is a more progressive tax scheme in raising revenues we answer this question in a life cycle economy with heterogeneity across households and endogenous labor supply our findings show that a tilt of the u s income tax schedule towards high earners leads to small increases in revenue maximal revenue in the long run is only 6 8 higher than in our benchmark about 0 8 of initial gdp while revenues from all sources increase by just about 0 6 our conclusions are that policy recommendations of this sort are misguided if the aim is to exclusively raise government revenue

the effectiveness of government debt and transfers as insurance abstract government debt and redistributive taxation can help people to smooth consumption when facing uninsurable individual specific risk i examine the effects that variations in public debt and transfers have on risk sharing efficiency and the distribution of resources i find that risk sharing can be improved significantly by both debt and transfers but that debt has adverse effects on equity when used in isolation debt will enhance welfare if transfers are lower than optimal however the beneficial effects of public debt vanish if transfers are used optimally

capital is back wealth income ratios in rich countries 1700 2010 how do aggregate wealth to income ratios evolve in the long run and why we address this question using 1970 2010 national balance sheets recently compiled in the top eight developed economies for the united states united kingdom germany and france we are able to extend our analysis as far back as 1700 we find in every country a gradual rise of wealth income ratios in recent decades from about 200 300 in 1970 to 400 600 in 2010 in effect today s ratios appear to be returning to the high values observed in europe in the eighteenth and nineteenth centuries 600 700 this can be explained by a long run asset price recovery itself driven by changes in capital policies since the world wars and by the slowdown of productivity and population growth in line with the s g harrod domar solow formula that is for a given net saving

advertising and economic welfare is advertising socially excessive economists have been reluctant to consider this question for there appeared to be no rigorous method of analyzing cases in which advertising influences tastes some recent studies have made fundamental contributions to this debate avinash dixit and victor norman 1978 yehuda kotowitz and frank mathewson 1979 but no consensus has emerged dixit and norman were the first to establish a rigorous methodology they evaluated social welfare sw consumer s surplus profits under preand post advertising market equilibria using pre advertising tastes for one ranking and post advertising tastes for another ranking when the sw rankings were identical dixit and normal claimed that unambiguous inferences could be drawn in general they concluded that the profitmaximizing level of advertising will be excessive under a variety of product market structures franklin fisher and john mcgowan 1979 criticized dixit and norman for including advertising in the utility function but ignoring the direct effect that advertising has on utility in their welfare analysis dixit and norman 1979 courvlered that advertising merely shifts the preference ordering over goods and that it is this preference yardstick that matters welfare conclusions about advertising can be generated less controversially within the framework suggested by george stigler and gary becker 1977 they treat utility as if it were generated by commodities which individuals produce with purchased goods time human capital and firms advertising their commodities can be interpreted similarly to what kevin lancaster 1966 calls a characteristic the terminology used herein as an example consider tennis we buy racquets and balls not to own them per se but rather to enjoy playing the game playing the game actually generates utility and this characteristic is produced by an individual s racquet balls human capital skill level and time thus preferences are ordered over characteristics not over goods advertising can lower the shadow price of a characteristic by increasing the ability of the purchased good to produce the desired characteristic this is accomplished by providing the consumer with different information or beliefs about the product than previously held suppose a perennial tennis champion states a preference for a particular brand of racquet this enhances the self image of amateur owners of that brand and increases their enjoyment of the game without changing their expenditures the per unit cost of the characteristic will decline making current owners of the racquet likely repeat customers and current shoppers more likely to choose the star s preferred brand observe that advertising has increased the demand for a market good that produces the now cheaper char

price leadership and dynamic aspects of oligopoly in u s manufacturing this study which covers a sample of 314 four digit industries taken from an exhaustive set of 450 four digit industries shows that increases in concentration associated with rising productivity occur mainly in low concentration industries while decreases in concentration associated with rising productivity occur mainly in high concentration industries the empirical results of this study indirectly lend support to a plausible hypothesis that a small group of firms makes a big impact on the productivity of an initially unconcentrated industry and thereby concentrates it later the small firms imitate the now big firms and concentration goes down while productivity keeps rising

advertising and consumer search in a duopoly model we consider a duopoly in a homogenous goods market where part of the consumers are ex ante uninformed about prices information can come through two different channels advertising and sequential consumer search we arrive at the following results first there is no monotone relationship between prices and the degree of advertising second advertising and search are substitutes for a large range of parameters third when the cost of either search or advertising vanishes the competitive outcome arises finally both expected advertised and non advertised prices are non monotonic in search cost one of the implications is that firms actually may benefit from consumers having low rather than high search costs

advertising in competitive markets in this paper small firms sell a homogeneous good to small consumers under conditions of free entry but consumers receive price information only through firms advertising in equilibrium every firm on the continuous price distribution buys less advertising than is socially optimal the result is robust if firms advertise in just one medium if readers of different advertising media are positively correlated excess advertising can occur in media used exclusively to advertise discount prices copyright 1991 by american economic association

redistributive taxation in a simple perfect foresight model abstract we investigate the redistributive potential of capital taxation in an intertemporal maximizing model of capital formation first even unanticipated redistributive capital taxation is severely limited in its effectiveness since it depresses wages second under any convergent redistributive tax policy which maximizes a paretian social objective the capital income tax will converge to zero independent of the factor supply elasticities these results are independent of workers holdings of capital

taxes transfers and employment in an incomplete markets model the consequences of increases in the scale of tax and transfer programs are assessed in the context of a model with idiosyncratic productivity shocks and incomplete markets the effects are contrasted with those obtained in a stand in household model featuring no idiosyncratic shocks and complete markets the main finding is that the impact on hours remains very large but the welfare consequences are very different the analysis also suggests that tax and transfer policies have large effects on average labor productivity via selection effects on employment

relative wage movements and the distribution of consumption we analyze how relative wage movements among birth cohorts and education groups affected the distribution of household consumption and economic welfare our empirical work draws on the best available cross sectional data sets to construct synthetic panel data on u s consumption labor supply and wages during the 1980s we find that low frequency movements in the cohort education structure of pretax hourly wages among men drove large changes in the distribution of household consumption the results constitute a spectacular failure of between group consumption insurance a failure not explained by existing theories of informationally constrained optimal consumption behavior a welfare analysis indicates that the cost of between group consumption variability is larger than the cost of aggregate consumption variability by two orders of magnitude

effective tax rates in macroeconomics cross country estimates of tax rates on factor incomes and consumption abstract this paper proposes a method for computing tax rates using national accounts and revenue statistics using this method we construct time series of tax rates for large industrial countries the method identifies the revenue raised by different taxes at the general government level and defines aggregate measures of the corresponding tax bases this method yields estimates of effective tax rates on factor incomes and consumption consistent with the tax distortions faced by a representative agent in a general equilibrium framework these tax rates compare favorably with existing estimates of marginal tax rates and highlight important international differences in tax policy

economics of public good provision auditing outsourcing and bribery this study investigates a government s contracting decision to audit or outsource the provision of a public good given a potential hidden bribe and information asymmetries the key findings are the following first the bribe and price of the public good are increasing in the corruptibility of the department second the bribe is decreasing in the firm s bargaining power third a bribery equilibrium exists when the department s corruptibility is sufficiently high given the firm s bargaining power a bribe involves extortion or a compensatory payment depending on the department s corruptibility only a compensatory bribe affects the department s contracting decision ce memoire examine une decision contractuelle d un gouvernement de produire un bien public lui meme et de faire une verification ou d aller en sous traitance pour la fourniture d un bien public compte tenu de la possibilite de pot de vin cache et d asymetries informationnelles les principaux resultats s enoncent comme suit d abord le pot de vin et le prix du bien public s accroissent avec le degre de corruptibilite du ministere ensuite la taille du pot de vin decline a proportion que le pouvoir de marchandage de la firme s accroit enfin un equilibre de corruption existe quand la corruptibilite du ministere est suffisamment elevee compte tenu du pouvoir de marchandage de la firme un pot de vin implique une extorsion ou un paiement compensatoire selon la corruptibilite du ministere seul un paiement compensatoire affecte la decision contractuelle du ministere

who is credit constrained in the u s economy an important assumption of the life cycle model of consumption is the postulate of perfect capital markets this hypothesis has recently been challenged by substantial empirical evidence hall and mishkin 1982 using the panel study of income dynamics estimate that 20 percent of united states families are liquidity constrained mariger 1986 derives a life cycle model with endogenous liquidity constraints and using a cross section estimates this fraction to be 19 4 percent hubbard and judd 1986 simulate a model with a constraint on net worth which shows that with reasonable assumptions about preferences 19 0 percent of united states consumers are liquidity constrained the emerging consensus points therefore to a fraction of approximately 20 percent of the population behaving in a manner that is inconsistent with the pure life cycle model in addition hayashi 1985 and zeldes 1989 investigate the correlation among consumption wealth and income for various population groups and infer that liquidity constraints are more important for younger families with low levels of wealth and saving the main limitation of these studies is that in their data sets constrained consumers are not observable and have to be identified via indirect evidence thus there is as yet little firm evidence about the characteristics of the consumers who are likely to be credit constrained this paper adopts an approach that differs from previous tests for liquidity constraints because it makes use of data where constrained consumers are observable and explicitly links their existence to credit market imperfections and personal characteristics the data drawn from the 1983 survey of consumer finances scf and described in section ii provide information on individuals whose request for credit has been rejected by financial intermediaries in section iii a model is developed in which consumers and lenders behavior jointly determines the probability that a consumer is rationed in the credit market this probability is then

profit entry and changes in concentration abstract the simultaneity between profit entry and changes in concentration is examined the sample includes 481 observations on 4 digit industries over the years 1972 1977 and 1977 1982 results show that profits respond positively to entry barriers and initial concentration net entry responds positively to initial profits and responds negatively to entry barriers concentration moves toward its steady state level but the rate of adjustment is very slow the competitive process left on its own does not seem to move quickly toward equilibrium

what determines the elasticity of industry demand abstract this paper develops estimates of price elasticity of demand for a sample of u s food and tobacco manufacturing industries and tests a model explaining differences in interindustry elasticity the empirical results are consistent with the hypothesis that demand elasticity is in part determined by the competitive behavior of firms in an industry in particular high advertising expenditures result in lower elasticities of demand other important variables influencing demand elasticity are industry concentration the stage of production the existence of protection from domestic and foreign entry and the extent of new product introduction in a particular market

equilibrium price distributions equilibrium price distributions for a homogeneous product consistent with individual incentives are investigated they arise in informationally imperfect markets in which the only primitive datum is the distribution of search costs it is shown that single multi and continuous price distributions are all viable long run phenomena depending on the nature of search costs a method for computing equilibrium price distributions is also provided jevons law of one price has long been an accepted dictum in economic theory in a classroom presentation it still serves sometimes implicitly as a major premise in many micro models of market interaction much of the descriptive theory as well as welfare analysis hinges on this assumption yet one s day to day experience reveals that price differentials are a viable phenomenon and that looking for lower prices may very well be a rewarding activity the prospects of eventually hitting a bargain and the resulting price reduction would more than compensate for the cost incurred during the search process moreover the existence of price dispersions appear to be an empirically stable phenomenon snapshots of markets for relatively homogeneous products reveal substantial and recurring price differentials stigler 1961 and pratt wise and zeckhauser 1979 for example report some evidence supporting this claim an important article by stigler 1961 focused economists attention on the crucial role played by the informational structure of markets it gave rise to the study of the

efficiency and market power in greek food industries this paper uses firm level data to examine the market power versus efficiency hypothesis by taking into consideration both the long run behavior of profitability and the possible endogeneity bias among profitability market share and advertising variables in a sample of 266 greek food manufacturing firms in the period 1987 95 two stage least squares results show both a direct effect of firm characteristics and an indirect effect of industry characteristics on profitability which do not provide support for the efficiency hypothesis alone but they do show that profitability is affected by both firm and industry variables

coordination economies advertising and search behavior in retail markets we introduce a model of the retail firm in which consumers and active firms benefit collectively from coordination of sales at fewer firms using this model we show that ostensibly uninformative advertising plays a key role in bringing about coordination economies by directing consumer search toward firms that offer the best deals optimal consumer search takes the form of a simple rule of thumb that uses observed advertising information to guide search both industry concentration and social surplus are higher in the presence of advertising relative to a no advertising benchmark jel d83 l15 many observed advertisements seem to be at odds with rational behavior in a variety of ads mostly on tv and radio multiproduct sellers provide little hard information choosing instead to impart only vague slogans that are suggestive of good deals examples are plentiful a hardware store

oligopolistic pricing with sequential consumer search n identical stores compete by choosing prices for a homogeneous good with constant marginal costs consumers search sequentially with perfect recall for the lowest price one class of consumers called shoppers have zero search costs while all other consumers have a positive search cost c there is a unique symmetric nash equilibrium price distribution with the property that it changes smoothly from marginal cost pricing when all consumers are shoppers and or c 0 and monopoly pricing when no consumers are shoppers remarkably as the number of stores increases the nash equilibrium becomes more monopolistic copyright 1989 by american economic association

advertising intensity and welfare in an equilibrium search model i analyze an equilibrium search model in a duopoly setting with bilateral heterogeneities in production and search costs in which firms can advertise by announcing price i compare the market advertising level to the socially optimal level where i find that costly search can improve welfare and that firms may under or over advertise relative to the social optimum depending on the costs of search the results suggest that in markets with sufficiently low search costs firms are likely over advertising relative to the socially optimal level and vice versa for markets with sufficiently high search costs

concentration profitability and trade in a simultaneous equation analysis the case of taiwan this paper is the first attempt to use a simultaneous four equation system to study the role of foreign trade in the analysis of market structure and performance and the determinants of trade intensity in a newly industrializing country taiwan a cross sectional analysis is carried out with the manufacturing censuses of 1976 the results indicate that public enterprises significantly influence market structures and performance also import control measures influence import intensity significantly and offset potential impacts of imports on concentration and on profitability however trade intensity is mainly explained by comparative advantage rather than market forces concentration and profitability

efficiency and equality in a simple model of efficient unemployment insurance abstract this paper describes the efficient allocation of consumption and work effort in an economy in which workers face idiosyncratic employment risk and considerations of moral hazard prevent full insurance we impose a lower bound on the expected discounted utility that can be assigned to any agent from any date onward and show with this feature added that the efficient unemployment insurance scheme induces an invariant cross sectional distribution of individual entitlements to utility the paper thus provides a simple prototype model suited to the study of the normative question what is the trade off between equality and efficiency in resource allocation journal of economic literature classification numbers d31 d63 d82 j65

search market equilibrium bilateral heterogeneity and repeat purchases abstract we develop a general model of search market equilibrium with heterogeneous buyers and sellers this framework unifies previous models with one sided heterogeneity and clarifies many of their special properties it easily accounts for price dispersion active search and the matching of buyer and seller types it also extends to repeat purchases once we embed it into a dynamic game with incomplete information we formalize the inferences and strategies underlying equilibria where firms charge constant prices and customers patronize them loyally we establish a general correspondence between such equilibria and single purchase markets journal of economic literature classification numbers d83 l13

leadership selection internal promotion and bureaucratic corruption in less developed polities the establishment of a professional government bureaucracy in place of political appointees is an important component of an enabling environment for private enterprise i show that internal promotion can help to bring to power individuals who highly value relative to income imposition of their preferences over collective goods on the public such individuals restrain the corruption of their subordinates as a byproduct of their efforts to implement their preferences using tax revenue as a result large scale and petty corruption tend to move together and both tend to be lower the longer the practice of internal promotion has been in place jel classification d73 selection des leaders promotion interne et corruption bureaucratique dans les pays en voie de developpement la mise en place d une bureaucratie gouvernementale professionnelle pour remplacer les nominations politiques constitue un element important pour creer un environnement porteur pour l entreprise privee on montre que la promotion interne peut aider a porter au pouvoir des personnes qui valorisent beaucoup la possibilite d imposer au public leurs preferences quant aux biens collectifs par opposition a la simple recherche de revenus personnels accrus de telles personnes vont limiter la corruption de leurs subordonnes en cherchant a imposer leurs preferences dans l usage des rentrees fiscales en consequence la grande et la petite corruption tendent aetre co reliees et toutes deux tendent a decroitre a proportion que l on pratique la promotion interne

intertemporal substitution in labor supply evidence from micro data the sensitivity of the supply of labor to intertemporal variation in the wage is an important issue in macroeconomics the analysis of social security and pensions and the study of life cycle patterns of work this paper explores two approaches to the measurement of intertemporal substitution that have appeared in the literature the first approach is to use consumption to control for wealth and unobserved expectations about future wages in the labor supply equation the second approach is to estimate a first difference equation for hours in which labor supply from the previous period serves as a control for wealth and wage expectations the results indicate that intertemporal substitution elasticity for married men is positive but small

the laffer curve revisited abstract laffer curves for the us the eu 14 and individual european countries are compared using a neoclassical growth model featuring constant frisch elasticity cfe preferences new tax rate data is provided the us can maximally increase tax revenues by 30 with labor taxes and 6 with capital taxes we obtain 8 and 1 for the eu 14 there 54 of a labor tax cut and 79 of a capital tax cut are self financing the consumption tax laffer curve does not peak endogenous growth and human capital accumulation affect the results quantitatively household heterogeneity may not be important while transition matters greatly

informative price advertising in a sequential search model the purpose of this paper is to study the role and implications of price advertising when shopping trips are costly to consumers to do so we introduce advertising into an optimal sequential search model information about prices is both gathered by consumers and disseminated by firms consumers search sequentially and stores advertise with various intensity when it is in their interest to do so our model has a unique equilibrium exhibiting priee dispersion the model generates predictions about the shape of the price distribution and firms advertising behavior we explore the effects of entry and find that when initial advertising costs at zero level of effort are precisely zero entry drives the equilibrium to the perfectly competitive outcome however when initial marginal advertising costs are positive entry drives prices higher and while the informed consumers almost surely locate competitive prices welfare does not necessarily increase finally we compare the effectiveness of the two informational channels when advertising costs shrink prices become competitive however when search costs shrink prices remain bounded above marginal production costs

public versus private provision of liquidity is there a trade off abstract to what extent is public debt private liquidity much policy advice given in the aftermath of the financial crisis rests on the assumption that increasing public debt relaxes borrowing constraints of private households this is the case for ad hoc debt limits which are exogenous to public policy instead if debt limits are fully endogenous as e g in the case of the natural borrowing limit public debt has no impact we assume that borrowing limits arise because of limited contract enforceability and are therefore determined as equilibrium outcomes using an incomplete markets economy in which households are subject to uninsurable earnings shocks we show that public debt provides some liquidity but less so than it would if constraints were imposed ad hoc we show that generating borrowing constraints as an equilibrium outcome substantially alters the answers to other important questions such as for the welfare effects of government debt or its impact on real economic activity

the good the bad and the civil society abstract there are three signature features of autocracies first there is a wide variety across autocracies in terms of economic performance some do much better and some much worse than democracies second economic performance of a given autocracy is more sensitive to leader quality and exhibits higher volatility third all autocracies good or bad tend to have weaker civil societies than democracies do we attribute these features to the core of the autocratic political institution the incumbent leader selects the future leader as opposed to citizens at large selecting the future leader under democracy we deliver our analysis in an overlapping generations model where two kinds of dynamic free riding problems arise the first arises among different generations of citizens in implementing far sighted policies political leaders come in two types good ones aim to correct this first kind of dynamic free riding problem while bad ones do not care and only aim to steal public assets both types need a weak civil society to achieve their goals but a second dynamic free riding problem arises among different leaders when it comes to weakening the civil society the autocratic leader selection mechanism helps resolve this second dynamic free riding problem results in a continuously weakened civil society and generates large variations of economic performances both within a given autocracy and across different autocracies a rich set of comparative statics is derived

on profitability and industrial concentration in pakistan abstract non inclusion of an important element of market structure in the profitability equation by earlier writers might have caused their estimates to suffer from specification error due to an omitted variable we have tried to formulate a more comprehensive model in which elasticity of demand advertising and concentration capture market structure while the supply side has been incorporated by including productivity other factors used to explain the degree of monopoly are capital intensity advertising and trade our results indicate that the main determinants of the profit margin are capital intensity rising productivity and industrial concentration we find that there was some dilution due to competition from foreign trade but its impact has been swayed by other factors

truly costly sequential search and oligopolistic pricing we modify the paper of stahl 1989 stahl d o 1989 oligopolistic pricing with sequential consumer search american economic review 79 700 12 by relaxing the assumption that consumers obtain the first price quotation for free when all price quotations are costly to obtain the unique symmetric equilibrium need not involve full consumer participation the region of parameters for which non shoppers do not fully participate in the market becomes larger as the number of shoppers decreases and or the number of firms increases the comparative statics properties of this new type of equilibrium are interesting in particular expected price increases as search cost decreases and is constant in the number of shoppers and in the number of firms welfare falls as firms enter the market we show that monopoly pricing never obtains with truly costly search d 2005 elsevier b v all rights reserved

search price setting and inflation a model of monopolistic competition in an inflationary environment is developed which embodies optimal sequential search price dynamics and entry on the part of consumers and firms respectively equilibrium price strategies are s s these bounds increase continuously with consumer search costs and so does price dispersion indeed the whole equilibrium varies smoothly from the competitive bertrand to the monopolistic diamond 1971 end of the spectrum the latter s paradoxical result is explained as a limiting case where frictions on firms side of the market price adjustment costs but not on buyers search costs tend to zero a positive relationship between smooth and perfectly anticipated inflation and price dispersion or uncertainty is established

consumer information and firm pricing negative externalities from improved information we analyze the effect of consumer information on firm pricing in a model where consumers search for prices and matches with products we consider two types of consumers uninformed consumers do not know in advance their match values with firms whereas informed consumers do prices are lower the greater the proportion of uninformed consumers hence uninformed consumers exert a positive externality on the others in contrast to standard results this leads to socially excessive investment in gathering prior information when aggregate demand is price sensitive

profitability concentration imports and exports the case of taiwan s midstream petrochemical industries based on an open economy oligopoly model causalities among domestic firms price cost margin pcm domestic concentration import and export shares are derived and a simultaneous equation system is established by utilizing the 1989 1997 data of taiwan s midstream petrochemical industries three stage least squares is used to estimate the system the empirical results confirm the derived results and demonstrate 1 there exist simultaneous relationships among domestic pcm domestic concentration import and export shares 2 import concentration affects domestic concentration positively but affects domestic pcm import and export shares negatively 3 diversifying international markets improves domestic firms pcm 4 domestic firms seem to be in a situation of collusion

the influence of increased foreign competition on industrial concentration and profitability abstract this paper uses the chilean manufacturing censuses of 1967 and 1979 to examine the effects of the chilean reforms in the mid 1970s on market structure and performance the reforms substantially increased the concentration in industry and substantially reduced profitability these outcomes are interpreted in the light of hypotheses about the effect of potential entrants on market structure and on the pricing behavior of incumbents next a cross sectoral simultaneous equations model of structure and performance is estimated to isolate the contribution of import and export shares to cross sectoral variations in concentration and profitability and to test for structural change between the two censuses the analysis confirms that the liberalization of trade changed the way import and export shares determined profitability and supports the import discipline hypothesis

the strategic nature of advertising in segmented markets we develop a simple model in which firm specific advertising has cooperative and predatory effects our model is set in a static market where firms are naturally segmented into two distinct submarkets several large firms located in the core with small firms operating as a fringe we test the net effect of opposing market size cooperative and market share predatory effects of both fringe and core firm advertising on the advertising decisions of large firms in several us consumer industries empirically fringe firm advertising leads to an increase in advertising efforts by large firms implying strategic complementarity on the other hand increased advertising by core firms in an industry decreases advertising expenditures of other core firms indicating they are strategic substitutes our findings imply that equilibrium levels of advertising can be greater with asymmetric rather than symmetric strategic interactions

endogenous partial insurance and inequality in this paper we propose a model of endogenous partial insurance and we investigate its implications for macroeconomic outcomes such as wealth inequality asset accumulation interest rate and consumption smoothing to this end we include participation costs to state contingent asset markets into an otherwise standard aiyagari 1994 model we highlight the resulting nonmonotonic relationship between wealth and insurance market participation when insurance is costly poor households remain uninsured middle class households participate in the insurance market whereas rich households decide to self insure by only purchasing risk free assets after theoretically characterizing the endogenous partial insurance equilibrium we quantify its effect emphasizing the roles of a participation channel and an interest rate channel

the king can do no wrong on the criminal immunity of leaders abstract in its recent anti corruption campaign china removed the criminal immunity originally enjoyed by its leaders absent fundamental changes in the political institution in which incumbent leaders instead of citizens at large select the next leaders such a partial reform pays off only if i it takes place at the right time ii it goes easy on corrupt low rank officials and iii the government is reasonably centralized failing any of these such a partial reform would lead to rampant corruption throughout the government hierarchy an outcome far worse than retaining leader immunity

the horizontally s shaped laffer curve in a neoclassical growth model with incomplete markets and heterogeneous liquidity constrained agents the properties of the laffer curve depend on whether debt or transfers are adjusted to balance the government budget constraint the laffer curve conditional on public debt is horizontally s shaped two opposing forces explain this result first when government wealth increases the fiscal burden declines calling for lower tax rates second because the interest rate decreases when government wealth increases fiscal revenues may also decline calling for higher taxes for sufficiently negative government debt the second force dominates leading to the odd shape of the laffer curve conditional on debt

the determinants of exit in an open economy in this paper the determinants of exit are investigated for the manufacturing sector of the united states economy which has been subjected to growing international influences the analysis uses united states cross sectional data the results of the exit equation suggest that low profitability declining industry growth and displacement of incumbents by entrants foster exit international influences are also seen to have an impact on u s manufacturing exit specifically imports into an industry have a small effect on exit and protection has little influence in stemming exit

the risk free rate in heterogeneous agent incomplete insurance economies abstract why has the average real risk free interest rate been less than one percent the question is motivated by the failure of a class of calibrated representative agent economies to explain the average return to equity and risk free debt i construct an economy where agents experience uninsurable idiosyncratic endowment shocks and smooth consumption by holding a risk free asset i calibrate the economy and characterize equilibria computationally with a borrowing constraint of one year s income the resulting risk free rate is more than one percent below the rate in the comparable representative agent economy

optimal taxation of capital income in general equilibrium with infinite lives this paper analyzes the optimal tax on capital income in general equilibrium models of the second best agents have infinite lives and utility functions which are extensions from the koopmans form the population is heterogeneous the important property of the models is the equality between the social and the private discount rates in the long run i find that the optimal tax rate is zero in the long run for a special case of additively separable utility functions i then determine the tax rates along the dynamic path and conditions that are sufficient for the local stability of the steady state

information gatekeepers on the internet and the competitiveness of homogeneous product markets we examine the equilibrium interaction between a market for price information controlled by a gatekeeper and the homogenous product market it serves the gatekeeper charges fees to firms that advertise prices on its internet site and to consumers who access the list of advertised prices gatekeeper profits are maximized in an equilibrium where a the product market exhibits price dispersion b access fees are sufficiently low that all consumers subscribe c advertising fees exceed socially optimal levels thus inducing partial firm participation and d advertised prices are below unadvertised prices introducing the market for information has ambiguous social welfare effects

does an endogenous relationship exist between environmental and economic performance a resource based view on the horticultural sector the aim of this paper is to analyse the relationship between environmental and economic performance from the resource based theory within firms of the fresh fruit and vegetables sector this study considers that the adoption of environment friendly practices has a greater influence on firms opportunities and abilities in the agricultural sector than in manufacturing sectors and leads to closer links between performance variables the reference for this empirical analysis is a panel data of horticultural farming marketing firms in spain the voluntary environmental programmes and the heterogeneity of their application lead us to regard acquiring a competitive advantage as a relevant driver to improve environmental performance in this sector a simultaneous equations model is suggested reflecting the differential environmental effect and the assumption of endogeneity among variables the results show a positive impact of environmental differentiation on profitability and market share also suggesting that the perception of this positive experience implies greater environmental performance