rainfall financial development and remittances evidence from sub saharan africa we use annual variations in rainfall to examine the effects that exogenous transitory income shocks have on remittances in a panel of 41 sub saharan african countries during the period 1970 2007 our main finding is that on average rainfall shocks have an insignificant contemporaneous effect on remittances however the marginal effect is significantly decreasing in the share of domestic credit to gdp so much so that at high levels of credit to gdp rainfall shocks have a significant negative effect on remittances while at low levels of credit to gdp the effect of rainfall on remittances is significantly positive

the missing dark matter in the wealth of nations and its implications for global imbalances current account statistics may not be good indicators of the evolution of a country s net foreign assets and of its external position s sustainability the value of existing assets may vary independently of current account flows so called return privileges may allow some countries to obtain abnormal returns and mismeasurement of fdi unreported trade of insurance or liquidity services and debt relief may also play a role we analyse the relevant evidence in a large set of countries and periods and examine measures of net foreign assets obtained by capitalizing the net investment income and then estimating the current account from the changes in this stock of foreign assets we call dark matter the difference between our measure of net foreign assets and that measured by official statistics we find it to be important for many countries analyse its relationship with theoretically relevant factors and note that the resulting perspective tends to make global net asset positions appear relatively stable ricardo hausmann and federico sturzenegger

social security liquidity constraints and pre retirement consumption one of the primary goals of the social security retirement program is the maintenance of consumption in old age in the past decade since the pioneering paper by feldstein 13 studies have examined the impact of the system on consumption over the entire life cycle and not just in old age empirical work has tested the impact on consumption of the individual wealth transfers accompanying the introduction of a pay as you go social security system extending this discussion of the impact of social security on pre retirement consumption hubbard 21 has shown in the context of lifetime uncertainty that even an actuarially fair fully funded social security system can raise lifetime consumption hence previous partial equilibrium estimates of the impact of social security on consumption drawn solely from consideration of the intergenerational wealth transfer at the introduction of the system are underestimates of the potential effect 2 an important assumption in the approaches cited above is that of perfect capital markets i e that individuals can borrow against prospective gains from participating in the social security system such an assumption is at variance with actual limitations on borrowing e g upward sloping interest rate schedules collateral requirements and quantity restrictions hayashi 18 found that approximately twenty percent of all consumption in the u s is accounted for by liquidity constrained consumers 3 flavin 16 found that the estimate of the marginal propensity to consume is affected dramatically by the inclusion of proxies for liquidity constraints suggesting that liquidity constraints are an important part of the observed excess sensitivity of consumption to current income since its inception in 1935 old age and survivors insurance oasi provided

crude oil trade and current account deficits abstract this paper provides an empirical exploration into the relationship between crude oil trade and a nation s current account for 91 countries over the 1984 2009 period reduced oil import dependence may initially reduce a country s general trade deficit under certain conditions the analysis probes the nature of this relationship and whether it holds equally to oil importing and oil exporting countries after controlling for other exogenous drivers we find that net oil exports are a significant factor in explaining current account surpluses but that net oil imports often do not influence current account deficits among all oil importers the one exception applies to relatively rich countries where higher oil imports appear to contribute to greater current account deficits one explanation for these trends is that oil exporters and wealthier oil importers may view oil income gains and losses as temporary income sources that influence their savings patterns

capital taxation and accumulation in a life cycle growth model almost all of the serious economic work on savings decisions within the past decade has relied on some variant of the life cycle hypothesis in which savings arise out of individual choices of an optimum lifetime consumption path this paper reexamines the incidence and welfare consequences of capital income taxes within a realistic life cycle model the results suggest that the elimination of capital income taxation would have very substantial economic effects for example a complete shift to consumption taxation might raise steady state output by as much as 18 percent and consumption by 16 percent the long run welfare gain from such a shift would for plausible parameter values exceed 150 billion annually stated somewhat differently shifting to consumption taxation would raise the lifetime utility of the representative consumer by the equivalent of about six years income in the new steady state these estimates dwarf estimates of the static welfare cost of taxation and significantly exceed even extreme previous estimates of the dynamic loss this study departs from earlier analyses of the effects of taxes on capital income in several respects probably the most important difference between this treatment and most preceding ones lies in the assumptions about the interest elasticity of saving it is shown below that the common two period formulation of saving decisions yields quite misleading results a more realistic model of life cycle savings demonstrates that for a wide variety of plausible parameter values savings are very interest elastic this implies that shifting away from capital income taxation would significantly increase capital formation making possible long run increases in consumption many studies of the welfare effects of capital income taxation have ignored the general equilibrium effects of increased capital formation in an economy with life cycle savings there is no presumption that the undistorted growth path corresponds to any sort of social optimum as peter diamond has shown life cycle savings can lead to a steady state capital intensity either greater or less than the golden rule level more generally it is clear that there is no reason to believe that a life cycle economy will maximize any particular intertemporal social welfare function a fundamental tenet of welfare evaluation is that preexisting distortions must be considered in evaluating the consequences of tax changes the results presented in this paper take explicit account of the nonoptimal character of the no tax steady state this explains in large part why such a sizeable welfare effect of capital taxes is found in an economy far from the golden rule level of capital intensity there are substantial gains in steady state consumption achievable through increased capital formation section i of the paper examines the aggregate savings function in a continuous time life cycle framework the second section clarifies the differences between wage and consumption taxes an aggregate production function is added to complete the model in the third section the effects of changes in capital taxes on both steady state incidence and welfare are considered within a general equilibrium framework the final section of the paper discusses some implications of the results and suggests areas which appear to warrant further study assistant professor of economics massachusetts institute of technology and research analyst national bureau of economic research i am grateful to alan auerbach martin feldstein laurence kotlikoff to the participants in the nber workshop on business taxation and to the harvard public finance seminar for useful discussions james poterba and james buchal performed the numerical calculations

avoiding an ecological regime shift is sound economic policy we extend the shallow lake model by adding the capital stock of an industry a government can mitigate the effects of pollution arising from industrial activities by imposing the requirement to abate emissions within this framework two scenarios are examined in the social optimal benchmark the social planner optimally allocates investment in the competitive equilibrium market forces determine the investment in capital but the government can still abate emissions we find that irreversible environmental regime shifts are avoided in the competitive equilibrium by means of a static level of abatement when it is socially optimal to do so

estimating the elasticity of intertemporal substitution using mortgage notches using a novel source of quasi experimental variation in interest rates we develop a new approach to estimating the elasticity of intertemporal substitution eis in the u k the mortgage interest rate features discrete jumps notches at thresholds for the loan to value ltv ratio these notches generate large bunching below the critical ltv thresholds and missing mass above them we develop a dynamic model that links these empirical moments to the underlying structural eis the average eis is small around 0 1 and quite homogeneous in the population this finding is robust to structural assumptions and can allow for uncertainty a wide range of risk preferences portfolio reallocation liquidity constraints present bias and optimization frictions our findings have implications for the numerous calibration studies that rely on larger values of the eis

financial integration capital mobility and income convergence recent studies have found that capital moves uphill from poor to rich countries and brings little or no growth dividend when it does flow into poor economies we show that europe does not conform to this paradigm in the european experience of financial integration capital has flown from rich to poor countries and such inflows have been associated with significant acceleration of income convergence analysing broader samples of countries we find that downhill capital flows tend to be observed above certain thresholds in institutional quality and financial integration but europe remains different even when allowing for such threshold effects and its experience is similar to that of interstate flows within the united states our findings are consistent with the notion that financial diversification reduces countries incentives to save in order to self insure against specific shocks abdul abiad daniel leigh and ashoka mody

how urban segregation distorts chinese migrants consumption summary this paper provides a new explanation for china s low consumption to gdp ratio by highlighting the constraints of the household registration system hukou on china s household consumption our baseline results show that the consumption of migrants is 16 20 lower than that of local urban residents we further find evidence suggesting that caused by hukou restrictions migrants save more for precautionary purposes have lower expectation of permanent income and consume much less durable goods because of high mobility moreover we have found no evidence that the consumption heterogeneity can be explained by migration effects culture or other forms of household heterogeneity as both the number and income level of migrants are rising quickly the constraining effects of hukou on household consumption is increasing 2014 elsevier ltd all rights reserved

land tenure arrangements and rural urban migration in china summary obstacles to internal migration in china contribute to inefficiency inequality and land degradation academic and policy debate has primarily focused on discrimination against rural migrants on arrival in urban areas meanwhile barriers to migration out of rural areas have received less attention this paper examines the role of incomplete rural property rights in the migration decisions of rural households we examine the relationship between tenure insecurity and restrictions on land rentals and participation in outside labor markets the results indicate that tenure insecurity reduces migration this relationship is particularly pronounced on forest land which has implications for the conservation of recently replanted forest areas

do tax incentives for saving in pension accounts cause debt accumulation evidence from danish register data abstract this paper applies a quasi experimental research design on a danish 2010 policy that reduced tax incentives for saving in annuity pension schemes to show significant substitution of savings from retirement accounts to gross debt repayments we find that for every 1 danish currency unit reduction in retirement savings 31 cents goes to debt repayments taking into account all types of savings we find full crowding out consistent with previous findings we document that the effect is driven by a minority about 23 percent who actively rebalance their savings

great expectations the subjective well being of rural urban migrants in china summary this paper is among the first to link the literatures on migration and on subjective well being in developing countries it poses the question why do rural urban migrant households settled in urban china have an average happiness score lower than rural households three basic hypotheses are examined migrants had false expectations about their future urban conditions or about their future urban aspirations or about their future selves estimated happiness functions and decomposition analyses based on a 2002 national household survey indicate that certain features of migrant conditions make for unhappiness and that their high aspirations in relation to achievement influenced by their new reference groups also make for unhappiness although the possibility of selection bias among migrants cannot be ruled out it is apparently difficult for migrants to form unbiased expectations about life in a new and different world

the transition from payroll to consumption receipts with endogenous human capital abstract the transition from payroll to consumption receipts is simulated in a life cycle growth model featuring adult human capital as in other studies savings are higher under the consumption base however unlike those studies much of the additional savings here take human form human capital production increases for all cohorts in or yet to join the labor market as of the tax change the additional human capital production tends to dampen physical capital accumulation when compared with otherwise identical simulations which hold human capital constant the implications for intergenerational incidence are similar to that found in other examinations of the transition to a consumption base

households saving in china china in recent years the world s largest and fastest growing economy also has national saving rates that are among the highest in the world this article considers a variety of statistical issues that cloud the measurement of aggregate and household saving in china it also provides new empirical evidence on the importance of intertemporal considerations in explaining the variation in household saving across china s provinces given china s size and its high saving rates it is not surprising that in recent year s considerable theoretical and empirical effort has been devoted to understanding its saving behavior this research can be divided into two broad strands the first emphasizes the relevance for china of traditional equilibrium theories of saving ranging from simple keynesian consumption saving functions to variants of the life cycle and permanent income hypotheses the second argues that equilibrium theories of saving are unlikely to be relevant in an economy in transition from plan to market instead disequilibrium factors especially shortages and rationing in goods and credit markets explain china s saving experience more broadly china s saving rate remains unusually high relative to international experience even after controlling for some of the determinants of saving

does financial reform raise or reduce saving the effect of financial liberalization on private saving is theoretically ambiguous not only because the link between interest rate levels and saving is itself ambiguous but also because financial liberalization is a multidimensional and phased process sometimes involving reversals using principal components we construct 25 year time series indices of financial liberalization for each of eight developing countries chile ghana indonesia korea malaysia mexico turkey and zimbabwe these are employed in an econometric analysis of private saving in these countries our results cannot offer support for the hypothesis that financial liberalization will increase saving on the contrary the indications are that liberalization overall and in particular those elements that relax liquidity constraints may be associated with a fall in saving

welfare effects of capital income taxation under variable and fixed labor supply not every model of economic behavior can allow for variable labor supply when attention is focused on other economic issues the effect on welfare change measurement of assuming labor to be in fixed supply becomes important the traditional view is that allowing labor supply to be variable will reduce the measured benefits of replacing an interest income tax with a payroll or consumption tax owing to the introduction or increase in a static distortion between consumption and leisure however this view ignores two mechanisms by which variable labor supply may actually increase the benefits of relaxing the capital income tax first an interest income tax distorts the intertemporal path of leisure and thus of labor supply second as explained below the interest elasticity of savings may be augmented by changes in the intertemporal labor supply path eliminating the labor supply path distortion and increasing capital accumulation can provide benefits which may potentially exceed the disadvantages of increased static distortion this paper tests which effects dominate by simulation in a life cycle growth model previous papers have not addressed these issues feldstein 3 discusses welfare measurement in a two period model in which an individual supplies labor in the first period and consumes in both periods feldstein s partial equilibrium efficiency measure incorporates the elasticity of labor supply with respect to the interest rate but his single period of labor supply may be misleading summers 8 demonstrates that in multi period models interest rate changes may have a large effect upon the present value of lifetime resources human wealth and consequently consumption that finding when applied to frameworks allowing for leisure consumption implies that both the compensated and uncompensated elasticities of labor supply with respect to the interest rate may be markedly different for multi period than for one period labor supply models summers exploits a multi period life cycle growth model to measure numerically the steady state efficiency gains following an elimination of interest income taxation he assumes labor to be fixed in supply at each moment consequently changes in human wealth cannot affect the leisure profile and the benefits of eliminating intertemporal leisure distortions are not captured summers concludes that steady state consumption and welfare would increase

precautionary behavior migrant networks and household consumption decisions an empirical analysis using household panel data from rural china abstract we develop a test of precautionary behavior in the consumption decisions of rural agricultural households among surveyed households facing a median level of consumption risk 10 of savings can be attributed to a precautionary motive and this increases to 15 for households with consumption per capita below the poverty line we next use distant lags of local rainfall shocks uncorrelated with current consumption growth to identify the size of migrant networks outside the village and then present evidence that both poor and nonpoor households engage in less precautionary saving as the size of the village migrant network increases

the later you pay the higher the k this paper shows the importance of the age path life cycle timing of any tax for the accumulation of capital in the economy income consumption and wage taxes differ in their age paths as well as their incentive effects this paper studies how the differing age path of each tax affects the capital accumulation of the economy in an empirically calibrated life cycle model we investigate lump sum age taxes and find in every case that the later the person pays tax the higher the k of the economy to analyze the life cycle timing effect of conventional transactions based taxes income consumption and wage we replace each tax with a lump sum age tax that has the identical age path of tax payments over the life cycle we find that the timing effect is quantitatively important and often causes the impact of a tax on capital accumulation to be very different from what would be predicted from the incentive effect

the interest elasticity of savings in developing countries the existing evidence abstract this paper presents a critical analysis of some of the most recent empirical work on the interest elasticity of savings in developing economies supported by a set of empirical results the paper argues that a the real interest elasticity of savings is not easily detected using the existing empirical models which generally yield insignificant interest rate parameters in the seventies b the existing models suffer from serious defects that make if very difficult to interpret the estimated parameters

tax policy the interest elasticity of saving and capital accumulation numerical analysis of theoretical models increasing disillusionment with traditional empirical methods is having a major impact on research methodology which is increasingly turning to simulation analysis based on theoretical models and assumed parameter values in research on saving and wealth accumulation there have been several recent studies consisting of simulation of theoretical models based on the life cycle model a particular focus has been tax policy and capital formation which is the area of concentration of this paper the aim is to analyze in a theoretical simulation context the impact on saving and wealth of an increase in the after tax rate of return to saving generated by a cut in the tax rate on income from capital this paper suggests that such simulation analysis while instructive as to the behavior of the class of models examined and as to the critical channels of influence does not yield a theoretical presumption in favor of cutting taxes on income from capital as a means of stimulating capital formation the development of this literature derives in part from disillusionment with traditional empirical methods many such papers begin by listing a litany of the problems involved in the usual type of empirical analysis before proceeding to simulation of theoretical structures the implicit conclusion at times appears to be that because of the daunting problems of standard empirical methodology the results derived from it can be ignored and that empirical magnitudes can perhaps be discovered by deductive means the temptation to think of the precise numerical results derived from theoretical simulation as empirical can be rather strong it needs to be reemphasized that empirical magnitudes can only be determined by empirical studies in section i the theoretical structure of a zero bequest life cycle model2 is outlined and several numerical simulations of this model are presented these simulations highlight interesting and nontrivial interactions of theoretical parameters and also demonstrate the difficulty involved in attempts to develop robust aggregate implications from such a framework for instance it is argued that summers claim to have developed a prima facie theoretical case for a high interest elasticity of savings 1981a p 537 does not stand up to sensitivity analysis a small change in the assumed rate of pure time preference or in other parametric assumptions generate otherwise plausible cases in which the interest elasticity of aggregate saving is low the experiments conducted in section i are partial equilibrium in the sense that the interest rate is changed exogenously which changes savings and hence the capital stock but the feedback effect of the capital international monetary fund this paper derives from chs 2 and 3 of my doctoral dissertation completed during a research fellowship at the brookings institution financial support was received from brookings and the social science research council i am grateful to henry aaron barry bosworth maxim engers irwin friend laurence kotlikoff franco modigliani joseph pechman duncan ripley robert shiller patricia stack and my supervisor albert ando for comments and guidance on earlier drafts none of the above institutions or individuals is responsible for the views expressed or any remaining errors for example see james tobin and walter dolde betsy white lawrence summers 1978 1981a b g moore alan auerbach and laurence kotlikoff and auerbach kotlikoff and j skinner 2it is popular to establish a sharp dichotomy between life cycle models and bequest models this taxonomy ignores the frequent references to the potential significance of bequests in the writings of the originators of the life cycle hypothesis a distinction between zero bequest life cycle models and life cycle models incorporating bequests is more accurate in terms of doctrinal history see for example albert ando and franco modigliani and modigliani and richard brumberg

fiscal incidence in an overlapping generations model with a fixed asset abstract we analyze a model of overlapping generations with a fixed factor land malleable capital and labor we consider the dynamic effects of various fiscal policies including taxes on rent wages and creation of public debt on capital accumulation land prices and intergenerational welfare minimal assumptions uniqueness and stability imply that a land tax may initially raise land values but the upper bound is less than one half of the tax revenues assuming homothetic utility the ratio between the long run capital responses to a land tax and to a lump sum transfer of equivalent revenue from the young to the old depends solely on the share of labor

population policies demographic structural changes and the chinese household saving puzzle abstract using combined data from population censuses and urban household surveys we study the effects of demographic structural changes on the rise of household savings in china variations in fines across provinces for unauthorized births under the one child policy and in cohort specific fertility influenced by the implementation of population control policies are exploited to facilitate identification we find evidence that older households with fewer adult children saved more middle aged households with fewer dependent children experienced increase in savings and younger households with fewer siblings also saved more these findings lend support to a simple economic model in which the effects of population control policies are investigated in the context of household saving decisions in china

marginal cost of public funds for different tax instruments and government expenditures the marginal cost of public funds that is the size of the direct and indirect excess burden costs for marginal tax revenues is examined in this paper for an open economy with a savings response and using swedish 1979 data the marginal cost of public funds spent on transfer payments is estimated to vary from 1 47 for a distributionally neutral tax on labor and capital to 7 20 for a more progressive tax where average and marginal labor taxes increase by the same rates for changes in the most important tax instrument the marginal cost of public funds varies from 0 98 for expenditures on infrastructure to 2 27 for transfer payments

climate threshold financial hoarding and economic growth we use an iterative finite difference method to establish theoretical models that reflect the relationships among climate threshold financial hoarding and economic growth we build a simultaneous equations model to conduct an empirical analysis based on china s statistical data from 1979 to 2012 our study yields the following results china s climate threshold has shown a zigzag shaped rising trend since 1979 the main reasons for the rapid expansion of financial hoarding were high savings rate savings leakage higher marginal efficiency of financial hoarding compared to capital efficiency or higher internal creativity of the financial sector there were positive cumulative effects between financial hoarding and economic growth which were significantly inhibited by climate threshold the climate threshold had discrepant influences on different industries to achieve a balanced economy more money should be invested in the real sector to appropriately reduce the rate of savings leakage the financial s

the after tax rate of return affects private savings level of savings and the rate of capital formation are of central concern to both economists and policymakers although the welfare effects of tax reforms do not directly depend on their impact on savings the effects of taxes on savings is crucial to considerations of tax incidence and equity and to the issue of long run growth the impact of the rate of return on consumption and savings decisions also bears on questions regarding the appropriate government discount rate the short run crowding out effects of fiscal policy and the effects of public indebtedness on capital intensity the traditional view among economists is that changes in the rate of return are likely to have only a small effect on the savings rate this consensus is supported by theoretical arguments pointing to the opposing income and substitution effects associated with changes in the rate of return the ambiguous implications of theory are matched by empirical studies which yield conflicting estimates as to the size of the impact of changes in the rate of return the polar empirical estimate is michael boskin s 1978 suggestion that the interest elasticity of savings is 4 this estimate is widely regarded as too high

are there cultural effects on saving some cross sectional evidence why are there such large differences in saving rates across countries conventional economic analyses have not been successful in explaining international saving differences so economists have sometimes suggested that national saving differences may be explained by cultural differences this paper tests the hypothesis that cultural factors influence saving by comparing saving patterns of immigrants to canada from different cultures using data from the canadian survey of family expenditures we find no evidence of cultural effects on saving

tax reform and intergeneration incidence abstract this paper presents a simple analytical framework for understanding intergeneration incidence from tax reform along the transitional growth path of life cycle economies by analyzing the incentive effects of taxes previous studies may give the impression that the impact on intergeneration incidence of converting an income tax to either a consumption or wage tax depends solely on the difference in such incentive effects within the framework of lump sum taxation this paper theoretically investigates under what circumstances the tax postponement effect would be relevant and how the timing of tax payments would affect intergeneration incidence

social identity and inequality the impact of china s hukou system abstract we conduct an experimental study to investigate the causal impact of social identity on individuals performance under incentives we focus on china s household registration hukou system which favors urban residents and discriminates against rural residents in resource allocation our results show that making individuals hukou identity salient significantly reduces the performance of rural migrant students relative to their local urban counterparts on an incentivized cognitive task and consequently significantly lowers their relative ranking in the earnings distribution under the piece rate regime however the impact of hukou identity salience is insignificant in the tournament regime suggesting that its negative effect on migrant students performance may be mitigated when competition is introduced the results demonstrate the impact of institutionally imposed social identity on individuals economic performance and potentially on inequality

financial development international capital flows and aggregate output abstract we develop a tractable two country overlapping generations model and show that cross country differences in financial development can explain three recent empirical patterns of international capital flows financial capital flows from relatively poor to relatively rich countries while foreign direct investment flows in the opposite direction net capital flows go from poor to rich countries despite its negative net international investment positions the united states receives a positive net investment income international capital mobility affects output in each country directly through the size of domestic investment and indirectly through the aggregate saving rate under certain conditions the indirect effect may dominate the direct effect so that international capital mobility raises output in the poor country and globally although net capital flows are in the direction to the rich country we also explore the welfare and distributional effects of international capital flows and show that the patterns of capital flows may reverse along the convergence process of a developing country our model adds to the understanding of the costs and the benefits of international capital mobility in the presence of domestic financial frictions

conspicuous consumption and race using nationally representative data on consumption we show that blacks and hispanics devote larger shares of their expenditure bundles to visible goods clothing jewelry and cars than do comparable whites these differences exist among virtually all subpopulations are relatively constant over time and are economically large although racial differences in utility preference parameters might account for a portion of these consumption differences we emphasize instead a model of status seeking in which conspicuous consumption is used as a costly indicator of a household s economic position using merged data on race and state level income we demonstrate that a key prediction of the status signaling model that visible consumption should be declining in reference group income is strongly borne out in the data for each racial group moreover we show that accounting for differences in reference group income characteristics explains most of the racial difference in visible consumption

is college financial aid equitable and efficient nk reed based financial aid is often defended both on grounds of equity and efficiency equity because it provides equality of opportunity and efficiency because it encourages the formation of productive human capital james 1988 however need is now determined in a way that is both inequitable and inefficient an informal survey of my colleagues who do not study financial aid revealed no one who named the financial aid system as a substantial tax on savings however once this interpretation was suggested they quickly revealed their unanimous and disturbing impression that savings are summarily confiscated from parents upon their first child s matriculation at university though exaggerated this impression is not without foundation two families with identical earnings paths pay dramatically different amounts for college if one saves more than the other thus while the financial aid system may contribute to vertical equity since the poor get more aid than the rich its horizontal inequities are substantial moreover the federal rules for financial aid raise significant efficiency concerns 1 they might conceivably distort many household decisions including family size and the spacing of children however this paper will focus upon the most important incentive distorted by present policies the incentive to save because saving leads to receiving less financial aid a family s return to saving is substantially below the social return this may lead to families making inefficient intertemporal choices and correspondingly to an inefficient loss of capital formation

is consumption growth consistent with intertemporal optimization evidence from the consumer expenditure survey in this paper we show that some of the predictions of models of consumer intertemporal optimization are in line with the patterns of nondurable expenditure observed in u s household level data we propose a flexible specification of preferences that allows multiple commodities and yields empirically tractable equations we estimate preference parameters using the only u s micro data set with complete consumption information we show that previous rejections can be explained by the simplifying assumptions made in previous studies we also show that results obtained using good consumption or aggregate data can be misleading

financial intermediation and delegated monitoring this paper develops a theory of financial intermediation based on minimizing the cost of monitoring information which is useful for resolving incentive problems between borrowers and lenders it presents a characterization of the costs of providing incentives for delegated monitoring by a financial intermediary diversification within an intermediary serves to reduce these costs even in a risk neutral economy the paper presents some more general analysis of the effect of diversification on resolving incentive problems in the environment assumed in the model debt contracts with costly bankruptcy are shown to be optimal the analysis has implications for the portfolio structure and capital structure of intermediaries

a portfolio model of capital flows to emerging markets since the crises of the late 1990 s most emerging market economies have built up substantial positive holdings of us dollar treasury bills while at the same time experiencing a boom in fdi capital inflows this paper develops a dsge model of the interaction between an emerging market economy and an advanced economy which incorporates two way capital flows between the economies the novel aspect of the paper is to make use of new methods for analyzing portfolio choice in dsge models we compare a range of alternative financial market structures in each case computing equilibrium portfolios we find that an asymmetric configuration where the emerging economy holds nominal bonds and issues claims on capital fdi can achieve a considerable degree of international risk sharing this risk sharing can be enhanced by a more stable monetary policy in the advanced economy

capital income taxation in a two commodity life cycle model the role of factor intensity and asset capitalization effects this paper discusses the impact of changes in capital income taxation in a two commodity life cycle general equilibrium growth model in contrast to the solow swan one commodity framework which has been used in previous life cycle policy simulation summers 1981 auerbach et al 1983 auerbath and kotlikoff 1983 1987 we use a two commodity uzawa 1961 1963 type model consumption and capital goods are separately identitied with an endogenously determined relative price between them as a result both asset capitalization effects changes in the relative price of capital and consumption goods and factor intensity effects across sectors are captured calculations with the model suggest that both of these effects

pollution the cost of public funds and endogenous growth abstract theories of endogenous growth are used to investigate the effect of environmental policy on the rate of economic growth and the provision of public goods in a second best market outcome pollution gives rise to a negative environmental externality and is modeled as an inevitable by product of production the government faces the dual task of on the one hand internalising environmental externalities and on the other hand raising public funds to finance public spending a tougher environmental policy reduces the rate of economic growth improves environmental quality raises the optimal tax rate and changes the composition of public spending away from productive government spending towards public consumption and abatement the marginal cost of public funds falls rises if productive government spending is negligible substantial relative to public consumption and abatement

how does future income affect current consumption this paper tests a straightforward implication of the basic life cycle model of consumption that current consumption depends on expected lifetime income the paper projects future income for a panel of households and finds that consumption is closely related to projected current income but unrelated to predictable changes in income however future income uncertainty has an important effect consumers facing greater income uncertainty consume less the results are consistent with buffer stock models of consumption like those of deaton 1991 or carroll 1992a 1992b where precautionary motives greatly reduce the willingness of prudent consumers to consume out of uncertain future income

the role of intergenerational transfers in aggregate capital accumulation this paper uses historical u s data to directly estimate the contribution of intergenerational transfers to aggregate capital accumulation the evidence presented indicates that intergenerational transfers account for the vast majority of aggregate u s capital formation only a negligible fraction of actual capital accumulation can be traced to life cycle or hump savings a major difference between this study and previous investigations of this issue is the use of more accurate longitudinal age earnings and age consumption profiles these profiles are simply too flat to generate substantial life cycle savings this paper suggests the importance of and need for substantially greater research and data collection on intergenerational transfers life cycle models of savings that emphasize savings for retirement as the dominant form of capital accumulation should give way to models that illuminate the determinants of intergenerational transfers

overshooting the savings target temporary migration investment in housing and development summary there are two seemingly competing branches of the literature on saving and duration of stay decisions of temporary migrants one relies on the target saving explanation and the other on utility maximization over a life cycle we attempt to reconcile the two approaches within a framework where a migrant has a well defined savings target in planning to purchase a new home at origin but also chooses the time of return and the consumption path to maximize lifetime utility our analysis highlights the role of property investment and savings repatriation in the relationship between temporary migration and development

international capital flows abstract the surge in international asset trade since the early 1990s has lead to renewed interest in models with international portfolio choice we develop the implications of portfolio choice for both gross and net international capital flows in the context of a simple two country dynamic stochastic general equilibrium dsge model we focus on the time variation in portfolio allocation following shocks and resulting capital flows endogenous time variation in expected returns and risk which are the key determinants of portfolio choice affect capital flows in often subtle ways the model is consistent with a broad range of empirical evidence an additional contribution of the paper is to overcome the technical difficulty of solving dsge models with portfolio choice by developing a broadly applicable solution method

economic growth and global warming a model of multiple equilibria and thresholds abstract we presume a simple endogenous growth model where global warming affects economic growth and analyze the dynamics of the competitive economy and of the social optimum our regulatory instrument is an emission tax rate we demonstrate that for certain values of the emission tax ratio the competitive economy exhibits multiple equilibria and a threshold may exist that separates the domains of attraction for the growth paths there exist paths to high growth rates and low temperature and low growth rates and high temperature for the planner s problem the long run equilibrium is unique unless the damage of global warming is very small

spatial and temporal efficiency in climate policy applications of fund fund is an integrated assessment model of the interactions between climate and economy nine world regions emit greenhouse gases and suffer damages from climate change a number of greenhouse gas emission reduction policies are compared including optimal and cost effective strategies strategies with early and late abatement and strategies with and without international co operation the analyses confirm that co operation matters resulting in substantially lower costs or higher welfare the real commitments of policy targets based on an absolute level e g 1990 emissions are hard to estimate because of the uncertainties in the baseline postponing action conflicts with minimising costs and maximising welfare but so does sharp emission reduction at the short term as proposed in the kyoto protocol

why countries differ in thin capitalization rules the role of financial development abstract the purpose of thin capitalization rules is to limit multinational firms possibilities of engaging in tax planning via debt shifting this paper analyzes the optimal design of thin capitalization rules in the presence of financial frictions when a host country in the first stage chooses the type of thin capitalization rule and then in the second stage decides about the strictness we show that welfare under a safe haven rule is higher than under an earnings stripping rule if firms are not able to manipulate the interest rate on internal loans welfare however can be higher under an earnings stripping rule if firms are able to manipulate the interest rate on internal loans we also show that the optimal level of internal interest deductions decreases with the financial development of the host country our results are consistent with countries actual policy choice

financial integration entrepreneurial risk and global dynamics abstract how does financial integration impact capital accumulation current account dynamics and cross country inequality we investigate this question within a two country general equilibrium incomplete markets model that focuses on the importance of idiosyncratic entrepreneurial risk a risk that introduces not only a precautionary motive for saving but also a wedge between the interest rate and the marginal product of capital our contribution is to show that this friction provides a simple explanation for the emergence of global imbalances a resolution to the empirical puzzle that capital often fails to flow from the rich or slow growing countries to the poor or fast growing ones and a set of policy lessons regarding the intertemporal costs and benefits of capital account liberalization

international and domestic collateral constraints in a model of emerging market crises abstract we build a model of emerging markets crises which features two types of collateral constraints firms in a domestic economy have limited borrowing capacity from international investors they also have limited borrowing capacity with respect to each other we study how the presence and changes in these collateral constraints affect financial and real variables a binding international constraint in the aggregate leads to a sharp rise in interest rates and fire sales of domestic assets while limited domestic collateral can lead to wasted international collateral these two collateral constraints can interact in important ways the first is disintermediation a fire sale of domestic assets causes banks to fail in their function of reallocating resources across the economy leading to wasted international collateral the second is a dynamic effect we show that firms in an economy with limited domestic collateral and a binding international collateral constraint will not adequately precaution against adverse shocks increasing the severity of these shocks

the external wealth of nations measures of foreign assets and liabilities for industrial and developing countries abstract although capital flows are closely monitored surprisingly little is known about the accumulated stocks of foreign assets and liabilities held by various countries especially in the developing world this paper constructs estimates of foreign assets and liabilities and their equity and debt subcomponents for a sample of 67 industrial and developing countries it characterizes the stylized facts of international balance sheets and asks whether there are trends in net foreign asset positions and shifts in debt equity ratios over time finally it explores the sensitivity of estimated stock positions to the treatment of valuation effects not captured in balance of payments data

credit traps and credit cycles we develop a simple macroeconomic model of credit market imperfections with heterogeneous investment projects the projects differ in productivity the investment requirement and the severity of agency problems behind the borrowing constraints a movement in borrower net worth shifts the composition of the credit between projects with different productivity levels thereby causing endogenous investment specific technological change furthermore such endogenous technological change in turn affects borrower net worth these composition effects could give rise to credit traps credit collapse leapfrogging credit cycles and growth miracles in the dynamics of the aggregate investment and borrower net worth jel e22 e44 o33

positive time preference the case for positive time preference is absolutely compelling unless there is an infinite time horizon with the expectation of unending technological advance combined with what we call drastically diminishing marginal utility this finding holds both in the positive and normative senses a corollary is that savings are interest elastic

financial market globalization symmetry breaking and endogenous inequality of nations this paper investigates the effects of financial market globalization on the inequality of nations the world economy consists of inherently identical countries which differ only in their levels of capital stock each country is represented by the standard overlapping generations model modified only to incorporate credit market imperfection an integration of financial markets affects the set of stable steady states as it changes the balance between the equalizing force of the diminishing returns technology and the unequalizing force of the wealth dependent borrowing constraint the model is tractable enough to allow for a complete characterization of the stable steady states in the absence of the international financial market the world economy has a unique steady state which is symmetric and stable in the presence of the international financial market symmetry breaking occurs under some conditions that is the symmetric steady state loses its stability and stable asymmetric steady states come to exist in the stable asymmetric steady states the world economy is endogenously divided into the rich and poor countries the borrowing constraints are binding in the poor but not in the rich the world output is smaller the rich are richer and the poor are poorer in any of the stable asymmetric steady states than in the unstable symmetric steady state

uncertain lifetime consumption and dissaving in retirement this paper asks whether the continued accumulation or mild dissaving observed among the retired can be explained by uncertain lifetime in the absence of annuities after an initial period influenced by borrowing constraints under constant relative risk aversion uncertain lifetime depresses consumption by a proportion increasing with age if the elasticity of intertemporal substitution in consumption is small illustrative computations based on actual income and survival data show that plausible elasticities are sufficiently small to give this effect the reduction in consumption is large enough to explain much of the lack of decumulation by the elderly

savings and wealth in models with altruistic bequests during recent years much attention has been given to the role of bequests in explaining various aspects of economic behavior for example authors have studied the impact of bequests on physical wealth accumulation laurence kotlikoff and lawrence summers 1981 the interest elasticity of savings owen evans 1983 tax reform laurence seidman 1984 and the distribution of wealth alan blinder 1976a more recently economists have begun to distinguish between human and physical bequests gary becker and nigel tomes 1986 acknowledging the presence of bequest in human form is important in analyzing each of the issues mentioned above outlays on children affect the shape of the family s labor supply and expenditure profiles upon which the level of aggregate savings crucially depends if these outlays are interest sensitive substitutes for physical bequests they will also influence the interest elasticity of savings in the area of tax reform the neutrality of the consumption tax depends on the ability of the government to identify human capital bequests from general consumption raymond batina 1987 if this is not possible the portfolio choice of investment in human versus physical capital may be distorted at the margin finally the unequal transmission of wealth across generations may be explained by the lack of physical bequests and the inefficiently low levels of human bequests made by wealthconstrained households becker and tomes 1986 to distinguish clearly the behavior of constrained households from unconstrained households who make sizeable physical bequests both types of bequests must be recognized this paper introduces a model that makes explicit examination of these issues possible it extends lord s 1989 multiperiod model of life cycle savings and adult human capital investment by adding altruistically motivated human and physical bequests 2 the model is calibrated using microeconomic data on earnings time and goods expenditures on children s human capital and physical bequests we then use the model to examine the contribution of bequests to wealth accumulation and the level of savings this topic is the source of an important but yet unresolved debate between franco modigliani 1988 and kotlikoff 1988 kotlikoff maintains that u s wealth accumulation is primarily the consequence of bequests as opposed to life cycle savings for retirement one type of evidence cited by kotlikoff comes from simulation results demonstrating the failure of realistically calibrated life cycle models to generate sufficiently high saving rates and wealth income ratios alan auerbach and kotlikoff 1987 we show however that if a pure life cycle

uncertain parameter values and the choice among policy options abstract we use a tax policy example to show how debate on the value of an elasticity parameter translates into a debate about policy choices to construct this example suppose that the choice among four particular tax reform options is based on a single measure of efficiency gain for each reform we show how the size of this gain depends upon the elasticity of saving with respect to the net rate of return moreover within quite narrow and reasonable bounds for the elasticity parameter we find regions in which each of three different tax reforms turns out to dominate the others

the consumption tax in the presence of altruistic cash and human capital bequests with endogenous fertility decisions abstract we provide an analysis of the consumption tax policy in the presence of cash bequests human capital investments in children and endogenous fertility decisions it is shown that the consumption tax is no longer neutral if the tax rate is constant over the taxpayer s life cycle labor supply is exogenous and the parent expects the offspring to pay the same tax rate if the number of children is chosen optimally by the parent neutrality breaks down because the shadow prices of both bequests and fertility are interlinked it is more expensive to produce a child the larger either bequest is and it is more expensive to make a bequest of either type to each child the larger the number of children produced several examples are provided where imposing the consumption tax induces an increase in the number of children produced and a decrease in net capital formation

factor mobility and wage inequality in the presence of specialisation based external economies abstract by making use of a simple general equilibrium model that is relevant to a high income developing country or a newly industrialised country this paper examines the link between factor mobility and wage inequality it is shown that in the presence of specialisation based external economies emigration of skilled as well unskilled labour increases wage inequality even if the income shares of capital are identical across industries on the other hand outflow of capital decreases wage inequality

a numerical simulation analysis of hukou labour mobility restrictions in china abstract we use numerical simulation methods to analyze the hukou system of permanent registration in china which many believe has supported growing relative inequality over the last 20 years by restraining labour migration both between the countryside and urban areas and between regions and cities our aim is to inject economic modelling into the debate on sources of inequality in china which thus far has been largely statistical we first use a model with homogeneous labour in which wage inequality across various geographical divides in china is supported solely by quantity based migration restrictions urban rural areas rich poor regions eastern central and western non coastal zones eastern and central western development zones eastern central western zones more disaggregated 6 regional classifications and an all 31 provincial classification we calibrate this model to base case data and when we remove migration restrictions all wage and most income inequality disappears results from this model structure points to a significant role for hukou restrictions in supporting inequality in china we then present a further model extension in which urban house price rises retard rural urban migration the impacts of removing hukou restrictions on migration are smaller but are still significant finally we modify the model to capture labour productivity differences across regions calibrating the modified model to estimates of both national and regional gini coefficients removal of migration barriers is again inequality improving but less so