pitfalls of a minimax approach to model uncertainty i it does not always keep the normative analysis of decision making distinct from its descriptive analysis losing sight of the fact that these methods are appealing shortcut approximations not improvements on decision making based on the savage axioms ii in all the existing applications to monetary policy it analyzes uncertainty about relatively unimportant aspects of models while making strong but actually uncertain assumptions about other more important aspects

solution of macromodels with hansen sargent robust policies some extensions abstract we summarize some methods useful in formulating and solving hansen sargent robust control problems and suggest extensions to discretion and simple rules matlab octave and gauss software is provided we illustrate these extensions with applications to the term structure of interest rates the time inconsistency of optimal monetary policy the effects of expectations on the variances of inflation and output and on whether central banks should make their forecasts public

probability models and robust policy rules abstract we consider sims s 2008 argument that robust policy making requires that policy models be treated as probability models in a welfare based setting we estimate by bayesian methods a number of variants of a new keynesian macroeconomic model and use both the model odds and posterior densities to design robust interest rate rules consisting of an inflation forecast based rule and a wage targeting one each are shown to have distinct robustness qualities and distinct implications for the probability models approach to ensure feasible policy we further impose that rules are stable determinate and lower bound compatible our results have important implications for the design evaluation and analysis of the probability models approach to robust monetary policy making

the economics of roscas and intrahousehold resource allocation this paper investigates individual motives to participate in rotating savings and credit associations roscas detailed evidence from roscas in a kenyan slum nairobi suggests that most roscas are predominantly composed of women particularly those living in a couple and earning an independent income to explain this phenomenon we propose an argument based on conflictual interactions within the household participation in a rosca is a strategy a wife employs to protect her savings against claims by her husband for immediate consumption the empirical implications of the model are then tested using the data collected in kenya

wealth inequality and intergenerational links previous work has had difficulty generating household saving behaviour that makes the distribution of wealth much more concentrated than that of labour earnings and that makes the richest households hold onto large amounts of wealth even during very old age i construct a quantitative general equilibrium overlapping generations model in which parents and children are linked by accidental and voluntary bequests and by earnings ability i show that voluntary bequests can explain the emergence of large estates while accidental bequests alone cannot and that adding earnings persistence within families increases wealth concentration even more i also show that the introduction of a bequest motive generates lifetime savings profiles more consistent with the data

local robustness analysis theory and application this paper develops a general framework for conducting local robustness analysis by local robustness we refer to the calculation of control solutions that are optimal against the least favorable model among models close to an initial baseline we provide nash and stackelberg equilibrium characterizations of the choice of control we apply this abstract formulation to a class of discrete time control problems this analysis is conducted using frequency domain methods and is shown to involve certain fundamental limits to the efficacy of controls in such environments finally we discuss some implications of our results for monetary policy

the income and tax share of very high income households 1960 1995 this paper presents new information on the fraction of adjusted gross income and of wages and salaries that is reported by taxpayers in the top one half of one percent of the income distribution this corresponds to roughly five hundred thousand households in the late 1990s this paper relies on data from the treasury s individual income tax model for the period 1960 1995 the definition of adjusted gross income is standardized so that changes in the tax law do not affect the measured concentration of agi the results suggest that the share of agi reported by the highest income households increased significantly between the early 1980s and the mid 1990s with most of the increase taking place in the years immediately following the tax reform act of 1986 while we find some evidence of transitory changes in the concentration of income around major tax changes which may be the result of income retiming by high income taxpayers re timing does not seem to explain most of the changes since 1986 this abstract was borrowed from another version of this item

the saving behaviour of a two person household the facts that wives are typically younger than their husbands and that women typically live longer than men imply that wives may have more incentive to save for old age than do husbands a theoretical model of the determination of household saving and portfolio choice is introduced which takes into account differences in preferences for saving the most important result is that the level and the composition portfolio of saving and the time path of consumption are dependent on the distribution of income within the household women typically live longer than men and wives are typically younger than their husbands these two facts imply that preferences about saving for old age in married households with forward looking members may differ between husband and wife this paper presents a theoretical analysis of saving and portfolio behaviour if the members of the household have differ ent preferences over future consumption as compared to current consump tion the analysis stands in contrast to unitary models of household intertemporal allocation which assume that the household has a single utility function thus this paper is a contribution in a novel context to the burgeoning literature on intra household decision making the base case analysis is for a simple two person husband and wife1 two period model in which there is only one asset saving it is assumed that because of the two facts given at the start of the introductory paragraph the husband discounts the future more than the wife in section ii the implications of a non cooperative decision making process for the base case are derived see ulph 1988 for a non cooperative model of demand and

intergenerational mobility and interpersonal inequality in an african economy how much economic mobility is there across generations in a poor primarily rural economy how much do intergenerational linkages contribute to current inequality we address these questions using original survey data on senegal that include a sub household measure of consumption for cells within the household while intergenerational linkages are evident we find a relatively high degree of mobility across generations associated with the shift from farm to non farm sectors and greater economic activity of women male dominated bequests of land and housing bring little gain to consumption and play little role in explaining inequality though they have important effects on sector of activity inheritance of non land assets and the education and occupation of parents especially the mother and their choices about children s schooling are more important to adult welfare than property inheritance significant gender inequality in consumption is evident though it is almost entirely explicable in terms of factors such as education and non land inheritance there are a number of other pronounced gender differences with intergenerational linkages appearing through the mother rather than the father

income inequality in the united states 1913 1998 this paper presents new homogeneous series on top shares of income and wages from 1913 to 1998 in the united states using individual tax returns data top income and wages shares display a u shaped pattern over the century our series suggest that the large shocks that capital owners experienced during the great depression and world war ii have had a permanent effect on top capital incomes we argue that steep progressive income and estate taxation may have prevented large fortunes from fully recovering from these shocks top wage shares were flat before world war ii dropped precipitously during the war and did not start to recover before the late 1960s but are now higher than before world war ii as a result the working rich have replaced the rentiers at the top of the income distribution

robust monetary policy with competing reference models abstract the existing literature on robust monetary policy rules has largely focused on the case in which the policymaker has a single reference model while the true economy lies within a specified neighborhood of the reference model in this paper we show that such rules may perform very poorly in the more general case in which non nested models represent competing perspectives about controversial issues such as expectations formation and inflation persistence using bayesian and minimax strategies we then consider whether any simple rule can provide robust performance across such divergent representations of the economy we find that a robust outcome is attainable only in cases where the objective function places substantial weight on stabilizing both output and inflation in contrast we are unable to find a robust policy rule when the sole policy objective is to stabilize inflation we analyze these results using a new diagnostic approach namely by quantifying the fault tolerance of each model economy with respect to deviations from optimal policy

a test of collective rationality for multi person households abstract this paper provides a test of efficiency of consumption decisions in households with many decision makers it also presents a method of determining the number of these decision makers information on some distribution factors is needed to implement this approach

monetary policy under misspecified expectations abstract this paper examines policy rule choices for a central bank that faces uncertainty about the process of expectation formations by economic agents the economy contains both rule of thumb agents who base their expectations on recent observations and agents who have rational expectations the central bank is uncertain about the fraction of the rule of thumb agents i find that when the economy is more forward looking the central bank responds more aggressively to inflation and output but the uncertainty averse central bank evaluates policies by the performance in the worst case in my economy the worst case is when a large fraction of agents are backward looking therefore the best policy for the uncertainty averse central bank involves moderate responses this minimax rule agrees more closely with empirically estimated less responsive taylor rules the paper also uncovers the importance of expectation formations on optimal policy choices

the distribution of wealth and fiscal policy in economies with finitely lived agents we study the dynamics of the distribution of wealth in an overlapping generation economy with finitely lived agents and intergenerational transmission of wealth financial markets are incomplete exposing agents to both labor and capital income risk we show that the stationary wealth distribution is a pareto distribution in the right tail and that it is capital income risk rather than labor income that drives the properties of the right tail of the wealth distribution we also study analytically the dependence of the distribution of wealth of wealth inequality in particular on various fiscal policy instruments like capital income taxes and estate taxes and on different degrees of social mobility we show that capital income and estate taxes can significantly reduce wealth inequality as do institutions favoring social mobility finally we calibrate the economy to match the lorenz curve of the wealth distribution of the u s economy

gender agricultural production and the theory of the household virtually all models of the household assume that the allocation of resources is pareto efficient within many african households agricultural production occurs on many plots controlled by different members of the household pareto efficiency implies that factors should be allocated efficiently across these plots i find in contrast that plots controlled by women are farmed much less intensively than similar plots within the household controlled by men the estimates imply that about 6 percent of output is lost because of inefficient factor allocation within the household the paper suggests a new approach to modeling intrahousehold allocation consistent with the empirical results

insurance policies for monetary policy in the euro area in this paper we aim to design a monetary policy for the euro area that is robust to the high degree of model uncertainty at the start of monetary union and allows for learning about model probabilities using the data that has become available since then to this end we compare and ultimately combine bayesian and worst case analysis using four reference models developed at the ecb and estimated with pre emu synthetic data we start by computing the cost of insurance against model uncertainty that is the relative performance of worst case or minimax policy versus bayesian policy we find that maximum insurance across this range of models can be obtained at moderate costs costs are measured in terms of lower expected performance relative to a bayesian policy with flat priors further scrutiny however highlights three shortcomings of this worst case insurance policy i prior beliefs that would rationalize the minimax policy from a bayesian perspective indicate that such insurance is strongly oriented towards the model with highest baseline losses ii the minimax policy is not as tolerant towards small perturbations of policy parameters as the bayesian policy and iii the minimax policy offers no avenue for incorporating posterior model probabilities derived from data available since monetary union thus we propose preferences for robust policy design that reflect a mixture of the bayesian and minimax approaches these preferences referred to as intermediate ambiguity aversion incorporate model probabilities while still giving extra weight to the worst uncertain outcomes we show how the incoming emu data may then be used to update model probabilities and investigate the implications for policy design

spousal control and intra household decision making an experimental study in the philippines i elicit causal effects of spousal observability and communication on financial choices of married individuals in the philippines when choices are private men put money into their personal accounts when choices are observable men commit money to consumption for their own benefit when required to communicate men put money into their wives account these strong treatment effects on men but not women appear related more to control than to gender men whose wives control household savings respond more strongly to the treat ment and women whose husbands control savings exhibit the same response changes in information and communication interact with underlying control to produce mutable gender specific outcomes

economic behavior marriage and fertility two lessons from polygyny abstract this paper derives and estimates an index of the relative importance of children in marriage by comparing the effect of husband s income on the actual number of wives in the household with the demand for wives derived from the number of children in the household moreover the paper presents the monogamy bias as a possible explanation for often observed low or negative income effects on fertility

the economics of polygyny in sub saharan africa female productivity and the demand for wives in cote d ivoire polygyny is still practiced throughout much of sub saharan africa with important social consequences this paper makes the first attempt to link african polygyny directly to the productivity of women in agriculture using micro data i develop a structural model of the demand for wives that disentangles wealth and substitution effects using a large household survey from cote d ivoire i find that marked geographic diversity in cropping patterns leads to regional variation in female labor productivity i also find that conditional on wealth men do have more wives when women are more productive that is cheaper this substitution effect may explain why polygyny declined in rural areas of cote d ivoire during agricultural development

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

polygyny fertility and savings sub saharan africa has a high incidence of polygyny it is also the poorest region of the world in this paper i ask whether banning polygyny could play any role for development using a quantitative model of polygyny i find that enforcing monogamy lowers fertility shrinks the spousal age gap and reverses the direction of marriage payments polygyny leads to high bride prices to ration women which makes buying wives and selling daughters a good investment thus crowding out investment in physical assets for reasonable parameter values i find that banning polygyny decreases fertility by 40 percent increases savings by 70 percent and increases output per capita by 170 percent

the risk of divorce and household saving behavior we analyze the causal impact of an increase in the risk of marital dissolution on the saving behavior of married couples we use the legalization of divorce in ireland in 1996 as an exogenous shock to the risk of divorce we propose several comparison groups unaffected by the law change that allow us to use a difference in differences approach our findings suggest that the legalization of divorce led to a significant increase in the propensity to save by married individuals which is consistent with individuals saving more as a response to the increase in the probability of marital breakup

the risk of polygamy and wives saving behavior in a polygamous society all monogamous women are potentially at risk of polygamy however the anthropological and economic literatures are silent on the potential impact of the risk of polygamy on the economic decisions of monogamous wives this paper explores this issue in senegal using individual panel data the paper first estimates a cox model for the probability of transition to polygamy second it estimates the impact of the predicted risk of polygamy on monogamous wives savings the findings show a positive impact of the risk of polygamy on female savings entrusted to formal or informal institutions which is suggestive of self protective strategies the increase in savings comes at the cost of reduced consumption of household food expenditures and wives private nonfood expenses