does employment protection create its own political support this paper investigates the ability of employment protection to generate its own political support a version of the mortensen pissarides model is used for this purpose if wages are set through nash bargaining workers value employment protection because it strengthens their hand in wage negotiations workers in high productivity matches benefit most from higher wages as they expect to stay employed for longer by reducing turnover employment protection shifts the distribution of match specific productivity toward lower values thus stringent protection in the past actually reduces support for employment protection today introducing involuntary separations reverses this conclusion now workers value employment protection because it delays involuntary dismissals workers in low productivity matches gain most since they face the highest risk of dismissal the downward shift in the productivity distribution is now a shift towards supporters

the neolithic revolution from a price theoretic perspective article i nfo the adoption of agriculture during the neolithic period triggered the first demographic explosion in history when fertility returned to its original level agriculturalists were more numerous more poorly nourished and worked longer hours than their hunter gatherer ancestors we develop a dynamic price theoretic model that rationalizes these events in the short run people are lured into agriculture by the increased labor productivity of both adults and children in the long run the growth in population overrides the productivity gains and the later generations of agriculturalists end up being worse off than the hunter gatherers counter intuitively the increase in the labor productivity of children causes the long run reduction in welfare in the long run the increase in adult labor productivity only contributes to population growth 2010 elsevier b v all rights reserved

a model of urban demography this study develops an overlapping generations model that involves the endogenous determination of demographic and city structure to fully analyze the social and natural changes in city populations we provide conditions under which the model exhibits the spatial features of demography observed in urban areas city centres have a lower total fertility rate than suburbs and larger cities have a lower total fertility rate than smaller cities through calibration we also show that spatial factors have a significant impact on demographic characteristics and city growth resume un modele de demographie urbaine cette etude developpe un modele de generations qui se chevauchent qui genere la determination endogene de la demographie et de la structure urbaine pour analyser pleinement les changements sociaux et culturels des populations urbaines on presente les conditions qui font que le modele genere les caracteristiques spatiales de la demographie observee dans les zones urbaines le centre ville avec un taux de fecondite plus faible que les banlieues et les grandes villes arborant une fecondite totale plus faible que les petites villes a l aide de calibration on montre que les facteurs spatiaux ont un impact significatif sur les caracteristiques demographiques et la croissance des villes

sources of intra industry wage dispersion how much do employers matter observed human capital explains less than half of wage variation in bls industry wage surveys establishment based wage differentials controlling for occupation account for 20 70 percent of intra industry wage variation this corresponds to a standard deviation in wages of 14 percent of the mean almost as large as interindustry wage variation investigation suggests that establishment wage differentials are not random variations or returns to usual measures of human capital

efficient education subsidization and the pay as you use principle abstract we investigate whether the pay as you use principle of public finance should apply to education subsidization for children to internalize human capital externalities in an intergenerational model with endogenous fertility leisure and accumulations of human and physical capital we characterize social optimality concerning physical and human capital accumulation leisure labor and fertility to guide the design of efficient education subsidization we show that efficient education subsidization requires future generations benefitting from it pay for it when fertility and leisure are endogenous namely the government should uphold the pay as you use principle to subsidize children s education by deficit and repay the debt by future taxes

the impossibility of a perfectly competitive labour market using the institutional theory of transaction costs i demonstrate that the assumptions of the competitive labour market model are internally contradictory and lead to the conclusion that on purely theoretical grounds a perfectly competitive labour market is a logical impossibility by extension the familiar diagram of wage determination by supply and demand is also a logical impossibility and the neoclassical labour demand curve is not a well defined construct the reason is that the perfectly competitive market model presumes zero transaction costs and with zero transaction costs all labour is hired as independent contractors implying that multi person firms the employment relationship and labour market disappear with positive transaction costs on the other hand employment contracts are incomplete and the labour supply curve to the firm is upward sloping again causing the labour demand curve to be ill defined as a result theory suggests that wage rates are always and everywhere an amalgam of an administered and bargained price

population concentration urbanization and demographic transition abstract this paper investigates how urbanization and demographic transition interrelate with each other via merits agglomeration economies and demerits congestion diseconomies of population concentration it reveals the mechanism by which agglomeration economies and congestion diseconomies affect the fertility rate furthermore analysis also shows that by assuming declines in infant and child mortality rate the model developed in this paper can replicate the following well known historical patterns i advances in urbanization ii rises in the wage rate iii declines in fertility and iv rises followed by declines in the population growth rate the inverted u shaped demographic transition

are those paid more really more productive the case of experience this study uses computerized personnel microdata on the white male managerial and professional employees at a major u s corporation to address the following question can the additional earnings which are associated with more labor market experience at a point in time really be explained by higher productivity at the same point in time our answer to this question based on both cross sectional and longitudinal information is that performance plays a substantially smaller role in explaining cross sectional experience earnings differentials and earnings growth than is claimed by those who have adopted the human capital explanation of the experience earnings profile this response depends critically on our assumption that the performance ratings which supervisors give to their white male managerial and professional subordinates adequately reflect the subordinates relative productivity in the year of assessment we present a great deal of evidence which strongly supports this assumption

factors affecting the output and quit propensities of production workers we formulate a simultaneous equation model to explain the wages output education and quit propensities of a sample of production workers our principal finding is that individuals that choose more education than we would expect from their observed characteristics have lower than expected quit propensities this relationship would bias standard estimates of rates of return to education we also find that the output of non whites was no lower than that of whites although their wages on previous jobs were lower and that workers with high levels of output were more likely to quit than were workers whose output was average

endogenous population with public goods and malthusian fixed resources efficiency or market failure a theoretical population model is developed which takes into account both the desire of a nation for a large population for political and economic reasons as well as the malthusian pressures that suggest that there is a natural tendency toward overpopulation the model assumes that parents care about both the number and well being of their children the results show that these two possible sources of externality do not lead to market failure nor to unfettered competitive individual decisions concerning childbearing that are detrimental to society annotation

are workers paid their marginal products status is like coase s social costs a reciprocal phenomenon given that one person s gain in status can occur only at the expense of a loss in status for others and that workers are free to choose their coworkers it follows that the competitive wage structure within a firm must be one in which individual wage differences understate individual differences in marginal products the purpose of this paper is to examine a variety of empirical evidence that relates to this proposition about the firm s internal wage structure the paper is organized as follows section i briefly summarizes the theoretical considerations that govern competitive wage determination when status matters to people and firms are viewed as voluntary associations of workers section ii then confronts the predictions of section i by examining pay and productivity schedules for a group of sales occupations for which these schedules are relatively easily observed section ii also examines the relationship between wages and productivity for a sample of university professors an occupation in which individual productivity differences are for a variety of obvious reasons relatively more difficult to measure all of the evidence examined is consistent with the hypothesis that within firms wage rates vary substantially less than do individual productivity values section iii discusses additional observations and evidence that bear on this same hypothesis it suggests that the implicit market for status may strongly influence the ways in which firms are organized to carry out the tasks they perform section iv concludes by considering the claim that egalitarian internal wage structures arise because of equity considerations it argues that the concept of equity appears very closely linked to the concept of status and suggests a strategy for assigning monetaty value to the equity considerations that so often dominate public policy decisions

intensive and extensive margins of fertility capital accumulation and economic welfare abstract this paper investigates the impact of low fertility on long term capital accumulation and economic welfare we find that the impact differs depending on whether the low fertility arises from a decrease in the fertility of mothers the intensive margin of fertility or the motherhood rate the extensive margin of fertility we show that an increase in the fertility of mothers decreases the capital stock and economic welfare conversely we identify a u shaped relationship between the extensive margin of fertility and the capital stock because of the existence of two opposing effects such that the decline in fertility may reduce economic welfare furthermore we show that an intragenerational income redistribution policy can eliminate the welfare loss resulting from the incomplete market

socially optimal social security and education subsidization in a dynastic model with human capital externalities fertility and endogenous growth abstract this paper considers socially optimal government policies in a dynastic family model with physical capital human capital endogenous fertility and positive spillovers from average human capital such spillovers reduce human capital investment but raise fertility from their social optimum we first characterize the social optimum with a non convex feasible set due to the quantity quality tradeoff concerning children we then show that social security and education subsidization together financed by labor income taxes can fully eliminate the efficiency losses of the spillovers and achieve the social optimum under plausible conditions however none of the policies can do so alone

an equilibrium model of search unemployment this paper develops a simple general equilibrium model with sequential search in which a nondegenerate wage offer distribution is endogenously determined we use this model to analyze the comparati

the baby boom and baby bust what caused the baby boom and can it be explained within the context of the secular decline in fertility that has occurred over the last 200 years the hypothesis is that a the secular decline in fertility is due to the relentless rise in real wages that increased the opportunity cost of having children b the baby boom is explained by an atypical burst of technological progress in the household sector that occurred in the middle of the last century this lowered the cost of having children a model is developed in an attempt to account quantitatively for both the baby boom and bust

fertility choice land and the malthusian hypothesis in a standard overlapping generations growth model with a fixed amount of land and endogenous fertility the competitive economy converges to a steady state with a zero population growth rate and positive consumption per capita the malthusian hypothesis is interpreted as a positive statement about the relationship between population growth and consumption per capita when production exhibits diminishing returns to labor and there is a fixed amount of land essential for production even when individuals care only about the number of their children and not about their children s welfare the equilibrium is such that they eventually would choose to have only one child for each adult hence if malthus s positive check on population is the result of the response of optimizing agents to competitively determined prices malthus s pessimistic conjecture is not necessarily true even though his other assumptions hold from authors

evidence on the demographic transition abstract this paper finds that fertility responds to productivity differently depending on the economy s stage of development at low levels of development productivity increases will increase fertility while at the more advanced stages of development productivity increases lower fertility during the process there may be important interaction effects between productivity and education demand increases in secondary education demand generate fertility declines regardless of the stage of development

property rights and efficiency in olg models with endogenous fertility is there an economic rationale for pronatalist policies we propose and analyze a particular market failure that leads to inefficiently low fertility in equilibrium the friction is caused by the lack of ownership of children if parents have no claim on their children s income the private benefit from producing a child can be smaller than the social benefit we analyze an overlapping generations model with fertility choice and parental altruism ownership is modeled as a minimum constraint on transfers from parents to children using the efficiency concepts proposed in golosov jones and tertilt 2007 we find that whenever the transfer floor is binding fertility choices are inefficient second we show that the usual conditions for efficiency are not sufficient in this context third in contrast to settings with exogenous fertility a payg social security system cannot be used to implement efficient allocations to achieve an efficient outcome government transfers need to be tied to fertility choice

where the minimum wage bites hard introduction of minimum wages to a low wage sector between 1993 and april 1999 there was no minimum wage in the united kingdom except in agriculture in this paper we study the effects of the introduction of a national minimum wage nmw in april 1999 on one heavily affected sector the residential care homes industry this sector contains a large number of low paid workers and as such can be viewed as being very vulnerable to minimum wage legislation we look at the impact on both wages and employment our results suggest that the minimum wage raised the wages of a large number of care home workers causing a very big wage compression of the lower end of the wage distribution thereby strongly reducing wage inequality there is some evidence of employment and hours reductions after the minimum wage introduction though the estimated effects are not that sizable given how heavily the wage structure was affected

a theory of wage dynamics a dynamic equilibrium model of long term implicit labour contracts under incomplete but symmetric information is developed workers are assumed to be risk averse and of unknown ability or productivity risk neutral firms learn as do workers about each worker s productivity by observing the worker s output over time it is shown that equilibrium contracts provide for wages which never decline with age and increase only when the worker s market value increases above his current wage in addition to characterizing the equilibrium wage contract we also derive some of its implications for the behaviour of aggregate wages across various groups of workers these implications explain some findings in the recent empirical literature on ageearnings profiles in particular our model can explain why earnings may be positively related to experience even after controlling for productivity as some empirical studies have indicated

an intergenerational model of population growth the problem of population growth has been only partially formulated in an intertemporal context therefore a link between population theory and economic growth theory is still missing this paper attempts to provide such a link by analyzing an intergenerational model of optimum population growth the model accommodates the idea that decisions on increases in population should consider the new population s quality of life this concept is elaborated upon in a static framework by gary becker and gregg lewis dennis de tray and robert willis other literature on population growth such as harold votey disregards this consideration altogether 2 more explicitly this paper assumes that the utility of each generation is a function of the level of its consumption and the number and utility of the newly born people we are thus led to consider the utility of an infinite number of generations this model differs from paul samuelson s intergenerational model of pure consumption in which the utility of each generation depends only on that generation s own consumption recently philip neher 1971 analyzed a model of fertility in primitive economies it is based on the assumption that parents use children as investments to insure future consumption needs neher s analysis focuses entirely on the pension motive for having children 3 our model assumes that fertility is determined so as to balance the parents welfare derived from additional children against that derived from the children s quality of life we first outline a general model of optimum population growth in order to discuss explicitly various economic aspects of population we use a simple case in the analysis section i sets up the basic model

persistent wage dispersion and involuntary unemployment it is costly for firms offers to workers to be turned down both because firms must make additional offers and making offers is costly and because capital is underused or unused provided that workers apply to at least two firms for jobs there will be wage dispersion in equilibrium and some workers will randomly fail to receive any wage offers firms in the same industry with access to the same technology may nevertheless choose different levels of capital intensity firms using capital intensive technologies will pay higher wages

household borrowing constraints fertility dynamics and economic growth abstract in this article we provide a model of growth with endogenous fertility in which multiple steady states derive from the modelling of household liquidity constraints we put forward an innovative approach to the finance of higher education by assuming that youths can borrow because their parents guarantee the loan repayment with their income young individuals can renege on their debt and lenders provide them credit only up to an amount which is commensurate to a collateral provided to children by their families parents care about children s education and choose a collateral which depends positively on family income and negatively on family size a stable trap of low development is characterized by high fertility rates and low investment in human capital on the other hand in economies with a sufficiently low starting rate of fertility borrowing constraints gradually vanish and the process of growth reaches a steady state characterized by the optimality of fertility and schooling choices government subsidies to education may reduce population growth and promote human capital investment if fertility at steady states is lower than thresholds

a test of competitive labor market theory the wage structure among care assistants in the south of england this paper examines the structure of wages in a very specific labor market care assistants in residential homes for the elderly on england s sunshine coast this sector corresponds closely to economists notion of what should be a competitive labor market both because it has a large number of small firms undertaking a very homogeneous activity in a concentrated geographical area and because the workers are neither unionized nor covered by any minimum wage legislation so that there are effectively no external constraints on the wage setting process the authors find that the wage structure deviates in important respects from what would be expected in a competitive labor market in particular wage dispersion is small within firms but large between firms and the wage dispersion that is present does not seem to be closely related to workers productivity related characteristics a test rejects the hypothesis that unobserved labor quality can explain these findings

more on marriage fertility and the distribution of income according to pareto 1896 the distribution of income depends on the nature of the people comprising a society on the organization of the latter and also in part on chance in the model developed here the nature of the people is captured by attitudes toward marriage divorce fertility and children singles search for mates in a marriage market married agents bargain about work and the quantity and quality of children they can divorce social policies such as child support requirements reflect the organization of the society finally chance is modeled by randomness in income marriage opportunities and marital bliss

the problem of population and growth a review of the literature from malthus to contemporary models of endogenous population and endogenous growth abstract this paper deals with the evolution of the literature on the problem of population and growth from the classical period to the recent literature on endogenous growth and development the problem concerns two distinct issues 1 how to explain the observed covariation of the levels and rates of growth of per capita income and population size over time and space and 2 how to improve the human condition represented by these variables through an accommodating social policy the evolution of the literature we survey is reflected by the progressive treatment of key variables as endogenous rather than exogenous to the growth process it is also reflected by a shift from the historical concern about population explosion and its implications for growth to the more recent concern about the association between growth and population implosion in many developed countries

intergenerational competitive equilibria under technological uncertainty and an exhaustible resource constraint abstract this paper presents a model of competitive intertemporal equilibrium in a finite horizon overlapping generations economy facing technological uncertainty and an exhaustible resource constraint individuals form rational expectations regarding future prices and economic conditions and income is redistributed from one generation to the next through government mandated lump sum transfers under uncertainty the relationship between resource price appreciation and the interest rate is mediated by consumers risk aversion with respect to consumption in alternative states of nature the intuitively appealing proposition that the expected resource price rises at the expected rate of interest holds only as a special case if future generations are taken to be state contingent in the sense that their composition depends on the states of nature prevailing when they are born then equilibria are generally pareto efficient but if future generations are state independent so that the set of individuals born at a given date is independent of the prevailing state of nature then equilibria may be inefficient because markets do not exist where successive generations may equilibrate their marginal rates of substitution across consumption in alternative contingent states such inefficiencies may be remedied through the implementation of appropriate intergenerational transfers an optimal intergenerational welfare distribution may be supported as a competitive equilibrium if the income transfer regime is properly selected and enforced the social optima that result for a simple version of the model under the maximin welfare criterion indicate that greater sacrifices are required on the part of the present generation when future generations are taken to be state contingent than when they are regarded as state independent this finding provides a possible explanation for the extreme risk aversion of conservationists with respect to the welfare of future generations

modelling price pressure in financial markets abstract we present experimental evidence that unlike traditional assumptions in economic theory security prices do not respond to pressure from their own excess demand instead prices respond to excess demand of all securities despite the absence of a direct link between markets we propose a model of price pressure that explains these findings in our model agents set order prices that reflect the marginal valuation of desired future holdings called aspiration levels in the short run as agents encounter difficulties executing their orders they scale back their aspiration levels marginal valuations order prices and hence transaction prices change correspondingly the resulting price adjustment process coincides with the global newton method the assumptions of the model as well as its empirical implications are fully borne out by the data our model thus provides an economic foundation for why markets appear to search for equilibrium according to newton s procedure

real wage determination and rent sharing in collective bargaining agreements the microeconomic forces that influence real wages are not fully understood this paper studies pay determination using data on approximately 600 labour contracts it finds that the real wage is an increasing function of past profitability in the employer s industry and a decreasing function of the level of unemployment in the employer s region these results are consistent with rent sharing theories

job duration seniority and earnings an important stylized fact about labor markets is that workers with longer seniority with their current employer have higher earnings than other workers with the same total labor market experience this study shows that workers in longer jobs earn more throughout than workers in a series of shorter jobs and that the measured positive cross sectional return seniority is largely a statistical artifact due to the correlation of seniority with an omitted variable representing the quality of the worker the job or the worker employer match the implication is tha t earnings do not in fact rise very much with seniority copyright 1987 by american economic association

can government enforcement permanently alter fertility the case of china i introduction in developing countries per capita output growth objectives are often stymied by high birth rates 1 traditional values ignorance of birth control technology and labor intensive farming are all factors which contribute to high fertility rates for those reasons many developing countries experiencing high birth rates adopt population control policies while most programs combine educational efforts with some form of persuasion many also provide strong economic disincentives to high fertility 2 of particular interest from this vantage point is the experience of the people s republic of china which stands alone in its use of quotas on child bearing decisions 3 china s population control policy began with a massive campaign in 1953 reversing an earlier pro natalist stance however that campaign was curtailed by the political turmoil arising from the great leap forward and the cultural revolution population control programs resumed in 1970 with the issuance and enforcement of three reproductive norms late marriage longer spacing between births and fewer children in 1979 the authorities went even further allowing each household to have only one child interest in china s experience arises not only from the severity of the restrictions but also due to the government s ability to enforce them the feasibility of enforcing these restrictions is a result of the deep penetration of the communist party into most aspects of an individual s life including its control over housing employment and salaries 4 however despite the government s extensive involvement in birth planning those who study chinese demography have debated the extent to which government policies are responsible for the large fertility decline in the 1970s 5 this paper uses recent advances in economic theory and econometrics to quantitatively assess the main sources of fertility fluctuations in china specifically we employ a model with endogenous fertility choice which modifies the framework of razin and ben zion 1975 and barro and becker 1989 6 in contrast to other papers we focus on the relationship between government enforcement of population control policies and fertility outcomes we also allow the fertility rate to be affected by 1 household preferences including alterations in taste as well as in education health care and the changing role of women and 2 production technology which mostly captures changes in agricultural output or income we perform simple comparative static analysis to examine long cycles in fertility and output and characterize the transitional dynamics which govern short cycles easterlin 1968 and lee and loschky 1987 provide nice discussions of long fertility cycles the long run steady state predictions will be used to identify the empirical structural vector autoregression var system as well as interpret the underlying structural disturbances additionally the transitional dynamics results can be compared to the estimated dynamic structure finally we employ a structural var as in blanchard and quah 1989 and ahmed ickes wang and yoo 1993 to econometrically disentangle the relative contributions of policy and economic development factors to changes in fertility growth the structural disturbances include a change in the government s enforcement power a technological advance in agricultural production and a preference shift toward a higher fertility rate all of which are capable of generating both short and long cycles in fertility and output we find that government enforcement power has a significant negative effect on fertility accounting for about one third of the variance of the forecast error for fertility growth after the first year an expansion in agricultural output on the other hand yields a short run positive impact on fertility growth and is responsible for almost one fifth of fertility growth variations furthermore while theoretically all shocks have the potential to generate long cycles only preference shifts have statistically significant long run effects

productive consumption and population dynamics in an endogenous growth model demographic trends and human development aid in developing economies abstract we find that by endogenizing the population growth rate a growth model under the productive consumption hypothesis is more tractable than models in previous studies and has interesting implications for population dynamics in the zero saving phase multiple saddle point stable steady states may exist and the population growth rate may rise or decline along a transition path in the positive saving phase such a steady state may exist uniquely and the population growth rate may decline with phase switching the population growth rate may follow an inverted u shaped curve human development aid may help an economy escape from an underdevelopment trap

the internal economics of the firm evidence from personnel data we analyze twenty years of personnel data from one firm the hierarchical structure is quite simple and stable career movements suggest that the employee s rate of learning and the firm s learning about ability are important there are promotion fast tracks exit rates vary little with tenure or salary the firm has personnel policies like those described in the internal labor markets literature although several theoretical preconditions for ilms such as ports of entry and exit are lacking job levels are important to compensation but there is also substantial individual variation in pay within levels our companion paper in this issue explores the wage policy of this firm

entertaining malthus bread circuses and economic growth we augment a simple malthusian model by allowing agents to consume something besides food whereas food in our case bread is both enjoyable and necessary for survival the other good circuses is pure entertainment it has absolutely no impact on survival but does enhance the quality of life with this very simple modification we show that whereas food supply may remain at subsistence technological change will have a great impact on the consumption of everything else most strikingly though the population remains bound by a malthusian constraint sustained improvements to living standards can no longer be ruled out we also argue that our model better fits the known historical facts the widely held belief that growth prior to the industrial revolution was flat is based largely on historical measures of food production although food supply throughout history may have been and for most individuals still is at or near subsistence levels technological advancements have brought greater convenience and comfort to wealthy and poor alike a possibility that malthus himself conceded in his later and often ignored work therefore our model not only describes historical growth patterns and demographic transitions better than traditional malthusian models but is also more in line with malthus later thinking jel classification numbers b10 i31 j1 n1 o30

peasants procreation and pensions producers and consumers durable goods yielding a stream of benefits which are compared with a stream of costs births occur if the present value of the benefits exceeds the present value of the costs the theory has been used by malthusians to rationalize the casual observation that population growth rates increase during the early stages of economic development and then perhaps fall later on as

capital accumulation income distribution and endogenous fertility in an overlapping generations general equilibrium model abstract this paper studies the intertemporal relationships among population growth income distribution inter generational social mobility skill composition of the labor force and household income in an overlapping generations general equilibrium model that aggregates household decisions regarding fertility savings and investment in human capital of children it shows that as a consequence of endogenous fertility the equilibrium path attains steady state from the second generation income tax transfer child taxation and social security taxation policies that can be devised to affect these variables are also analyzed the model provides a structural explanation for the inverse household income child quantity and negative child quality quantity relationships that are observed in developing countries it also shows that group interests may hinder the emergence of perfect capital markets with private initiatives

workers trust funds and the logic of wage profiles this paper defines a concept a worker s trust fund which is useful in analyzing optimal age earnings profiles the trust fund represents what a worker loses if dismissed from a job for shirking in considering whether to work or shirk a worker weighs the potential loss due to forfeiture of the trust fund if caught shirking against the benefits from reduced effort this concept is used to show that the implicit bonding in upward sloping age earnings profiles is not a perfect substitute for an explicit up front performance bond or employment fee it is also shown that the second best optimal earnings profile in the absence of an up front employment fee pays total compensation in excess of market clearing in a variety of stylized cases

health spending savings and fertility in a lifecycle dynastic model with longevity externalities we investigate health spending savings fertility and policy implications in a lifecycle dynastic model with longevity externalities in annuity returns we show that such externalities engender not only excessive health spending but also under saving and excessive fertility social security and health subsidization increase health spending and savings but reduce fertility from laissez faire levels a publicly funded universal health system under labour income taxation raises fertility taxing health spending or using social security and public health together can obtain socially optimal health spending savings longevity and fertility numerical results based on us observations suggest substantial variations among these cases especially in old age health spending

urban economic theory land use and city size this book examines the economic reasons why people choose to live where they live and develops through analysis of the bid rent function a unified theory of urban land use and city size the first part of the book explicates the basic theory of urban land use and optimal city size residential location behavior of households is examined in a microeconomic framework and equilibrium and optimal patterns of residential land use are discussed the corresponding equilibrium and optimal city sizes are studied in a variety of contexts part two extends the classical theories of von thunen and alonso with the addition of externality factors such as local public goods crowding and congestion and racial prejudice the rigorous mathematical approach and theoretical treatment of the material make urban economic theory of interest to researchers in urban economics location theory urban geography and urban planning

monopsony and the lifetime relation between wages and productivity we consider the relation between wages and productivity by means of a model based on the following assumptions workers live for 2 periods firms live forever senior workers differ nontrivially from junior seniority enhances workers expected second period earnings both firms and workers recognize the prospect of promotion and the senior junior wage differential at the time of hiring and firms have monopsony power in hiring junior workers we show that senior wages are equal to the senior marginal product but junior wages are set below the junior marginal product by an amount that depends on the elasticity of the firm s labor supply

the old age security hypothesis revisited abstract children s altruism toward parents is allowed in a two overlapping generations model with endogenous fertility parents raise children because when retired they expect gifts from their children who are essentially a capital good individuals behavior between generations is examined by analyzing a nash equilibrium which is then compared with a social planner s optimal allocation the pay as you go public pension program is viewed as the optimal gifts from the optimal allocation when the latter is implemented the effect on fertility of the introduction of a capital market is also analyzed the validity of the old age security hypothesis is shown to depend on the parameters of utility and cost functions

population age structure and the size of social security this paper uses a general overlapping generations model to analyze social security rather than focusing on intertemporal price and income considerations however the paper focuses on the effect of contemporaneous same period prices and income the analysis shows that the old age dependency ratio acts as a shadow price for old age benefits with this new shadow price the equilibrium price and quantity of social security benefits and the level of the payroll tax rate are determined in a demand supply framework with individual utility maximization three explicit demand functions intergenerational contracts are analyzed the model is tested using u s time series data for the social security old age and survivors oasi program excerpt

economic geography fertility and migration abstract this paper analyzes the relationship among economic geography fertility and migration the empirical evidence presented reveals that persistent regional variations in fertility exist within a country and that regional total fertility rates are negatively related to regional population density a two period overlapping generations model of endogenous fertility incorporating n regions agglomeration economies and congestion diseconomies is constructed to explain this negative relationship while agglomeration economies have both positive income and negative substitution effects on fertility congestion diseconomies have a negative income effect on it combined with the mobility of people interaction among these effects generates the negative relationship as a steady state equilibrium outcome it is also shown that net migration from regions with lower population density to regions with higher population density occurs in an equilibrium which in turn maintains the regional variations in fertility

the pay as you go pension system as fertility insurance and an enforcement device a paygo system may serve as insurance against not having children and as an enforcement device for ungrateful children who are unwilling to pay their parents a pension in fact the latter was bismarck s historic motive for introducing this system it is true that the paygo system reduces the investment in human capital but if it is run on a sufficiently small scale it may nevertheless bring about a welfare improvement if on the other hand the scale of the system is so large that parents bequeath some of their pensions to their children it is overdrawn and creates unnecessarily strong disincentives for human capital investment

pay as you go public pensions with endogenous fertility abstract veall s 1986 model of public pensions is generalized to allow for endogenous fertility we show that gifts to the old which can be viewed as social security contributions are always positive in the steady state an optimal stationary allocation is sustainable if savings are zero and fertility is exogenous however the optimal allocation is in general not sustainable in particular if a government enforces a social security plan setting the pension level at the optimal gifts and individuals optimize under the pension constraint the resulting sustainable outcome is in general different from either the optimal or nash outcome

the effect of job tenure on wage offers a wage offer can be either acceptable or unacceptable to a worker but in cross sectional and panel data only acceptable wage offers are observed an ols wage equation will not reveal how job tenure affects wage offers but rather will reveal how tenure affects acceptable wage offers by jointly modeling the firm s determination of the wage offer and the worker s decision to accept or reject the offer we are able to estimate the effect of job tenure on wage offers consistently in contrast to the usual ols results we find that job tenure has no statistically significant effect on wage offers

population and the environment a parable of firewood and other tales the author analyzes the relationship between population and the environment with a focus on the role which environmental degradation and natural resources depletion may play in producing the population pressure which lies behind such degradation and depletion especially in developing countries the principal conclusion of this analysis is that the possibilities for a stable equilibrium between human population and its environment are quite limited i show that parental altruism toward their children can only make matters worse if socially unchecked by leading to an increase of the birthrate in every environmental state in comparison with that which would occur in its absence excerpt

the brain drain and the world distribution of income abstract skilled emigration or brain drain from developing to developed countries is becoming the dominant pattern of international migration today such migration is likely to affect the world distribution of income both directly through the mobility of people and indirectly as the prospect of migration affects the rate of return to education in both the sending and receiving economies this migration pattern will therefore affect human capital accumulation and fertility decisions in both the sending and receiving economies this paper analyzes these effects in a dynamic two country model of the world economy where agents in both countries make optimal fertility and human capital decisions the implications of the analysis for the world distribution of income are derived in the light of recent empirical findings of the brain drain literature the analysis shows that the current trend towards predominantly skilled emigration from poor to rich countries may in the long run increase inequality in the world distribution of income as relatively poor countries grow large in terms of population in the short run however it is possible for world inequality to fall due to rises in gdp per capita in large developing economies with sufficiently low skilled emigration rates

allocative efficiency of markets with zero intelligence traders market as a partial substitute for individual rationality we report market experiments in which human traders are replaced by zero intelligence programs that submit random bids and offers imposing a budget constraint i e not permitting traders to sell below their costs or buy above their values is sufficient to raise the allocative efficiency of these auctions close to 100 percent allocative efficiency of a double auction derives largely from its structure independent of traders motivation intelligence or learning adam smith s invisible hand may be more powerful than some may have thought it can generate aggregate rationality not only from individual rationality but also from individual irrationality

the u s demographic transition between 1800 and 1940 the u s went through a dramatic demographic transition in 1800 the average woman had 7 children and 94 percent of the population lived in rural areas by 1940 the average woman birthed just 2 kids and only 43 percent of populace lived in the country the question is what accounted for this shift in the demographic landscape the answer given here is that technological progress in agriculture and manufacturing explains these facts

an econometric analysis of the old age security motive for childbearing a switching regression for birth interval lengths with endogenous switching is developed to test mead cains contention that parents fertility decisions arise from lexicographic preferences for old age security the model is estimated as a survival model using malaysian data assuming that contraceptors constitute the group of parents who have attained the minimal number of children with which they feel their old age support is secure strong support for cains concept of old age security as the principal interest of those parents who have not yet attained a sufficient number of children appears in these data however the income effect accompanying the provision of alternative means of old age support generates an ambiguous effect on subsequent fertility excerpt

endogenous fertility and optimal population size pareto optimality which is the standard criterion of efficiency in general equilibrium models takes population size as given and therefore cannot be directly applied to analyze the question of optimal population size the criterion then for optimal population size must be based on a more restrictive definition of optimality this paper extends peter diamonds 1965 golden golden rule growth model by assuming that individuals derive utility from their own consumptionand from their own children offspring are assumed to consume resources before reaching adulthood the authors show that the optimal steady state utility yields a higher population growth rate when it converges to the golden rule allocation they then demonstrate that a voluntary social security program in which the size of the transfer to a particular agent is directly tied to his own fertility leads the competitive allocation to be identical to the allocation corresponding to the maximum of the steady state utility of the representative individual

changing world prices women s wages and the fertility transition sweden 1860 1910 this time series analysis examines during 1860 1910 the impact of changes in local prices of agricultural commodities on wages among men and women in sweden and the impact of changes in wages on fertility decline child mortality urbanization and improved social conditions linear ordinary least squares models are set up to determine whether demand induced increases in womens wages relative to mens are significant factors in explaining swedish total fertility rates data are obtained from 25 counties and the city of stockholm among pooled observations for six time periods during 1860 64 and 1910 14 this period is marked by a total fertility decline of 28 a marital fertility decline of 26 and a child mortality decline of 52 explanatory variables are the relative prices of main agricultural outputs employment outside of agriculture the proportion of urban population and the child mortality rate findings indicate a significant relationship between child mortality and total fertility and specific fertility rates among women aged 20 39 years a doubling of the male real wage rate was significantly associated with earlier marriage higher birth rates among women aged 15 29 years and lower birth rates among women aged 35 49 years the ratio of male wages to female wages was associated with a decline in birth rates at all ages with the exception of teenagers 66 of fertility increase was due to declines in child mortality but this increase was counterbalanced by fertility decline among older women child mortality and urbanization depressed marital fertility male wages increased the proportion married a 10 increase in the male female wage rate was associated with a 25 reduction in the total fertility rate another 25 increase in the male female wage rate was associated with a 50 reduction in child mortality it is concluded that the value of womens time had a key impact on the swedish fertility transition

implicit contracts a survey 7mplicit contracts resolve the distribution of uncertainty and utilization of specific human capital between risk averse workers and less risk averse firms incomplete contracts are required to yield involuntary layoffs in contract markets otherwise contracts are efficient and pareto optimal by construction there is a close relation between contract theory and neoclassical labor market theory contracts smooth consumption but increase the volatility of labor supply and labor utilization to demand disturbances because contractural insurance eliminates the income effects of socially diversifiable risks this result is similar to the intertemporal substitution hypothesis however the price mechanism in a contract is substantially different contracts embody a nonlinear two part pricing scheme the lump sum part allocates the income consumption consequences of risks and the marginal pricing part allocates production and labor utilization this implicit pricing mechanism is in all respects flexible though the observed average hourly wage combines both parts and may give the outward appearanceof rigidity furthermore the observed average wage rate in a contract does not reflect marginal conditions necessary for structural econometric estimation indivisibilities appear necessary to account for the split between work sharing and layoffs contracts with private information are also considered in the nonlinear pricing context this abstract was borrowed from another version of this item

population technology and growth from malthusian stagnation to the demographic transition and beyond this paper develops a unied growth model that captures the historical evolution of population technology and output it encompasses theendogenous transitionbetween three regimes that have characterized economic development the economy evolves from amalthusianregime wheretechnologicalprogressis slow andpopulationgrowthprevents anysustainedriseinincomepercapita intoapost malthusianregime wheretechnological progress rises and population growth absorbs only part of output growth ultimately a demographic transition reverses the positive relationship between income and population growth andtheeconomyentersamoderngrowthregimewithreducedpopulationgrowth

fixed or flexible wage setting in search equilibrium why do some vacancies offer a posted wage whereas others offer a negotiable wage the paper endogenizes the choice of wage policy in a standard sequential search model with heterogeneous workers in particular we identify circumstances such that there exists an equilibrium in which all firms negotiate wages we find that this equilibrium exists if and only if the labour market is sufficiently tight and worker heterogeneity is sufficiently large

explaining pay as you go financed public pension systems abstract the existence of pay as you go payg financed public pension plans is usually explained by median voter models or by strategic non saving behavior by young generations here it is claimed that both types of models are neither sufficient nor necessary for explaining payg systems

costs of adjustment and the spatial pattern of a growing open city this paper investigates the effect of costs of adjustment on the dynamic characteristics of intra urban resource allocation the analysis is concentrated on the development pattern of an open city within a system of many cities both in steady state and in variable state economies competitive equilibrium of the urban system as a whole is also discussed and compared to pareto optimum allocation some of the results that characterize the resource allocation under static analysis are reestablished for the dynamic case as well but others that follow from comparative statics are shown to be incorrect under the dynamic analysis

the regional effects of germany s national minimum wage abstract we show that the minimum wage introduced in germany in 2015 led to spatial wage convergence in particular in the left tail of the distribution without reducing relative employment in low wage regions within the first two years

the u s westward expansion the u s economic development in the 19th century was characterized by the westward movement of population and the accumulation of productive land in the west this article presents a model of migration and land improvement to identify the quantitatively important forces driving these phenomena the conclusion is that the decrease in transportation costs induced the westward migration whereas population growth was responsible for the investment in productive land

population growth and human capital investments theory and evidence this paper presents evidence from empirical studies that test hypotheses derived from models of household behavior pertaining to the interrelationships among population growth human capital and economic development these studies have exploited quasi natural experiments embodied in the cross area variability in the wage rates of children in a number of low income countries the intercouple variation in the biological propensity to conceive and the geographically selective introduction of new high yielding seed varieties in india in the period 1961 71 the different varieties of evidence support the hypotheses that alterations in the returns to human capital associated with exogenous technical change lead simultaneously to increases in human capital investments and to reductions in fertility and that the costliness of fertility control is a significant but modest factor in inhibiting human capital investments

endogenous fertility multiple growth paths and economic convergence abstract this paper extends the cass koopmans optimal growth model to allow for endogenous fertility choice it is shown that if agents choose their fertility rate then the net rate of return on capital marginal product of capital minus the population growth rate may not be monotonically decreasing in capital in this case multiple steady states and growth paths may emerge which can explain the persistent differentials in income between poor and rich countries as well as the existence of development miracles and disasters the paper provides also empirical evidence which supports the existence of multiple convergence groups and is consistent with the theoretical model

intergenerational transfers and demographic transition abstract this paper presents an analysis of demographic transition based on the endogenous evolution of intergenerational transfers along an economy s endogenous path of development two period lived agents belonging to overlapping generations choose optimally their desired levels of consumption and fertility together with their desired sizes of transfers to both parents and children parents are more efficient than children in producing output but some parental time must be devoted to child rearing at low levels of development fertility is high and the flow of net intergenerational transfers is from the young to the old at high levels of development fertility is low and the flow of net transfers is from the old to the young these results accord strongly with empirical observations and the analysis may be seen as formalising for the first time a long standing and well respected hypothesis in the demographic transition literature

wage differentials employer size and unemployment the unique equilibrium solution to a game in which a continuum of individual employers choose permanent wage offers and a continuum of workers search by sequentially sampling from the set of offers is characterized wage dispersion is a robust outcome provided that workers search while employed as well as when unemployed the unique nondegenerate equilibrium distribution of wage offers is constructed for three cases 1 identical workers and employers 2 identical employers and an atomless distribution of worker supply prices and 3 identical workers and an atomless distribution of job productivities copyright 1998 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

social security and endogenous fertility pensions and child allowances as siamese twins abstract this paper analyses public pensions and child support in a model with endogenous fertility we show that the individual fertility choice may not coincide with the social optimum due to the existence of external effects of children on society as a whole the market outcome without government intervention is efficient however as the externalities exactly cancel out in that case if the government wants to redistribute towards the old it cannot replicate the command optimum by merely applying lump sum transfers but rather needs a child allowance scheme to effectively alter the number of offspring finally we analyse whether a pareto improving social security reform is possible it is shown that merely reducing the payg scheme cannot be pareto improving but the introduction of a child allowance scheme can be

social security intergenerational transfers and endogenous growth in this paper the effects of social security in a simple model of endogenous growth with alternative motives of having children are analyzed it shows how the effects of social security depend on the size of the social security tax the motive to have children and the pattern of intergenerational transfers the pattern of intergenerational transfers itself however is shown to change with the social security tax rate when the social security tax is not too high social security increases per capita income growth and tends to enhance welfare

complements versus substitutes and trends in fertility choice in dynastic models demographers emphasize decreased mortality and economic development as the main contributors generating the demographic transition contrary to previous findings we show that simple dynastic models a la barro becker can reproduce observed changes in fertility in response to decreased mortality and increased productivity growth if the intertemporal elasticity of substitution is low enough we show that this is largely due to number and welfare of children being substitutes in the utility of parents in this case we find that with an ies of one third model predictions of changes in fertility amount to two thirds of those observed in u s data since 1800 between 1800 and 2000 fertility choice in the united states underwent a dramatic transition depending on estimates it fell from about six children per woman to around two children per woman this demographic transition from a state of high fertility and high mortality to low fertility and low mortality has been documented by demographers and historians in the united states and in every other developed country in the world over this same period natural rates of population growth net of immigration also fell but less substantially demographers have not reached a consensus on the root causes of this transformation but list several changes as likely main contributors these include reductions in infant and child mortality rates imrs and cmrs and the process of industrialization and economic development the work in demography and history on this topic has largely been limited to empirical studies with almost no choice based modeling of the type seen in economics even there issues of the timing of changes