annual and cropping season environmental production conditions effects on smallholder technical efficiency in sub saharan africa evidence from ethiopia this article investigates the impact of environmental production conditions on smallholder farmers technical efficiency in ethiopia for wheat maize and sorghum farming we use a household panel data set with annual and cropping season environmental production conditions to estimate the technical efficiency scores the results show that including environmental production conditions in the stochastic frontier has a significant impact on farmers technical efficiency scores technical efficiency scores improve when environmental production conditions are incorporated in the stochastic frontier thus accounting for environmental production conditions reduces the inefficiencies that otherwise may be attributed to the characteristics of smallholder farmers

the incentive effects of medicaid on women s labor supply this paper investigates medicaid s impact on women s labor supply behavior while taking into account medicaid s link to the afdc program the data were extracted from the 1986 current population survey a majorfinding is that medicaid valued as government provided health insurance has a significant negative impact on an average female head s probability of working for instance a i0 percent increase in medicaid would reduce a head s probability of working by 9 to 1 3 percentage points contrary to expectations medicaid is found to have a generally insignificant effect on hours worked

the effect of food stamps on labor supply a bivariate selection model abstract although there is a large literature on the effects of u s transfer programs on labor supply this is the first such study of the food stamp program we model the nonlinearity and nonconvexity of the budget constraint and use maximum likelihood methods to estimate hours of work functions for female heads of household the largest recipient group in the program we also model the joint response to afdc and food stamps and we account for the existence of a significant number of eligible households who do not participate in the programs a three equation bivariate selection model is estimated on a sample of eligible households with maximum likelihood

policy watch the marriage penalty many government programs have implicit penalties or subsidies for marriage for example many couples pay higher income taxes when married than their combined tax liabilities as single filers while many other couples receive a marriage subsidy because their joint taxes fall with marriage likewise most low income couples are eligible for higher welfare benefits if they are separated rather than married this article discusses the marriage penalty with a particular focus on tax and transfer programs why does it exist who faces it to what extent does it affect marriage and labor market behavior what tradeoffs are involved in reducing it

social approval values and afdc a re examination of the illegitimacy debate this paper models the fertility decision of individuals who differ in their wage rate and their intensity of preferences for rearing children and whose utility of having a child out of wedlock depends on the level of social approval associated with doing so this social approval in turn is a function of the fraction of individuals in previous generations that chose to have children out of wedlock the model is a straightforward extension of the typical rational choice model that motivates much of the empirical literature a literature that has cast doubt on a strong link between afdc and illegitimacy however the model introduces elements from epidemic models that many have in mind when arguing for such a link as a result the predictions of this extended model are consistent with empirical findings while at the same time linking the rise in illegitimacy solely to government welfare programs specifically a program similar to afdc is introduced into an economy with low illegitimacy rates and a trans

widows waiting to wed re marriage and economic incentives in social security widow benefits in this paper we focus on an age restriction for remarriage in the social security system to determine if individuals respond to economic incentives for marriage aged widow er benefits are paid by the federal government to persons whose deceased spouses worked in social security covered employment a widow er is eligible to receive benefits if she or he is at least age 60 if a widow er remarries before age 60 he or she forfeits the benefit and therefore faces a marriage penalty under current law there is no penalty if the remarriage occurs at 60 years of age or later we investigate whether this rule affects the marriage behavior of widows specifically we examine the rates of remarriage of women around age 60 under current as well as past social security eligibility rules using data from the vital statistics our results provide compelling evidence that this group of women respond to economic incentives when considering the decision to remarry first the 1979 law change that eliminated the marriage penalty for those at least age 60 resulted in a large increase in the marriage rate for widows at

estimation of stochastic frontier production functions with time varying parameters and technical efficiencies using panel data from indian villages abstract a stochastic frontier production function with time varying technical efficiencies is estimated using panel data from icrisat s village level studies in three indian villages given the specifications of a linearized version of a cobb douglas stochastic frontier production function with coefficients which are a linear function of time the hypothesis that the traditional response function is an adequate representation of the data is accepted for only one of the three villages the hypothesis of time invariant technical inefficiencies is not rejected for one of the two villages for which significant technical inefficiencies exist the hypothesis of time invariant elasticities of the input variables is rejected for two of the three villages further the hypothesis that hired and family labour are equally productive is accepted in only one of the three villages the technical efficiencies of individual farms exhibited considerable variation in the two villages with either time invariant or time varying technical efficiencies

did the affordable care act young adult provision affect labor market outcomes analysis using tax data using a data set of us tax records spanning 2008 to 2013 the authors study the impact of the affordable care act aca young adult dependent coverage requirement on labor market related outcomes including measures of employment status job characteristics and postsecondary education they find that the aca provision did not result in substantial changes in labor market outcomes results show that employment and self employment are not statistically significantly affected although some evidence supports the increased likelihood of young adults earning lower wages not receiving fringe benefits enrolling as full time or graduate students and young men being self employed the magnitudes imply extremely small impacts on these outcomes in absolute terms and when compared to other estimates in the literature the authors find these results to be consistent with health insurance being less salient to young adults compared to other populations when making labor market decisions

incentive effects of the u s welfare system a review the author would like to acknowledge support for prior work on this topic from the u s department of health and human services and helpful comments from three anonymous referees rebecca blank howard chernick john fitzgerald irwin garfinkel peter gottschalk edward gramlich david greenberg judith gueron james heckman v joseph hotz robert hutchens michael keane frank levy larry mead michael murray robert plotnick anuradha rangarajan philip robins howard rolston jeffrey smith and daniel weinberg all opinions and errors are those of the author alone

the medicaid notch labor supply and welfare participation evidence from eligibility expansions i assess the impact of losing public health insurance on labor market decisions of women by examining a series of medicaid eligibility expansions targeted toward young children these targeted expansions severed the historical tie between afdc and medicaid eligibility the reforms allowed a mother s earnings to increase without losing public health insurance for her young children increasing the income limit for medicaid resulted in a decrease in afdc participation and an increase in labor force participation among these women the effects were large for ever married women and negligible for never married women

the effect of old age assistance on retirement abstract researchers have devoted considerable attention to analyzing the impact of social security on retirement with mixed findings however the means tested program old age assistance oaa dwarfed social security until the 1950s and coincided with the early decline in elderly labor force participation also oaa benefits were determined by the states a key source of policy variation i estimate the relationship between oaa benefits and elderly participation using individual data from the 1940 and 1950 censuses oaa s impact is found to be strong and implies that participation would have risen slightly instead of falling if benefits had not increased during the 1940s

bounds on elasticities with optimization frictions a synthesis of micro and macro evidence on labor supply how can price elasticities be identified when agents face optimization frictions such as adjustment costs or inattention i derive bounds on structural price elasticities that are a function of the observed effect of a price change on demand the size of the price change and the degree of frictions the degree of frictions is measured by the utility losses agents tolerate to deviate from the frictionless optimum the bounds imply that frictions affect intensive margin elasticities much more than extensive margin elasticities i apply these bounds to the literature on labor supply the utility costs of ignoring the tax changes used to identify intensive margin labor supply elasticities are typically less than 1 of earnings as a result small frictions can explain the differences between micro and macro elasticities extensive and intensive margin elasticities and other disparate findings pooling estimates from existing studies i estimate a hicksian labor supply elasticity of 0 33 on the intensive margin and 0 25 on the extensive margin after accounting for frictions

the impact of housing costs on the living arrangements of single mothers abstract this paper investigates the impact of housing costs on a single mother s living arrangement decision whether to head her own household or live in the household of other adults the empirical analysis is conducted using individual level data from the 1986 current population survey and msa level housing cost data based on hud s fair market rents consistent with a priori expectations the major finding is that increased housing costs significantly reduce a single mother s probability of household headship this result is especially pronounced for single mothers under age 36

welfare recipient work choice and in kind benefits in washington state we analyze the work choice of welfare recipients potential welfare recipients compare their on and off welfare utility from after tax income and in kind benefits via employment or welfare and choose whether to work our null hypothesis which we reject is that benefits affect only the decision to work or not not the hours worked which will depend on wages using temporary assistance for needy families tanf administrative data from washington state we find that employer provided health insurance and child care subsidies significantly raise exit rates of tanf recipients and induce greater work effort other work inducing factors include wages and the earned income tax credit while increased levels of medicaid food stamps and the income guarantee increase welfare dependency

cross state variation in medicaid programs and female labor supply john c navin using a pooled cross section data set from the 1980 through 1993 current population survey march supplements we test if different medicaid benefit levels across states impact the labor supply behavior of female heads of households the ordinary least square ols results support the prediction that medicaid expenditures reduce labor supply controlling for state fixed or random effects alters the effect of both afdc and medicaid on the decision to participate as well as the number of hours worked we also find that while the effects of program generosity are sensitive to the inclusion of state effects those of variation in eligibility thresholds are not jel j22 i introduction the issue of the design and effects of government policies aimed at providing support for children is at the center of an ongoing national debate social scientists policy makers and the public at large have all focused their attention on the benefits and perhaps even more so the costs to society of this support network these costs are perceived to take not just monetary forms but also to have adverse incentive effects in terms of work out of wedlock births divorce etc much of this debate has focused on the adverse effects of the cash components of welfare aid for families with dependent children afdc and food stamps but recently other programs have become embroiled in this debate as the costs of health care have risen government provided medicaid benefits have also come under increasing scrutiny medicaid expenditures are one of the fastest rising components of state budgets state medicaid spending rose by 80 in real terms between 1980 and 1990 rising from 19 1 billion to 33 7 billion further state medicaid expenditures increased even more dramatically in the past few years rising about 19 in 1990 91 and 22 5 in 1991 92 up until the mid 1980s medicaid coverage was primarily limited to recipients of afdc and indigent senior citizens over the last ten years however medicaid coverage has been altered to include individuals with incomes above the afdc maximum primarily pregnant women or children whose parents have incomes at or slightly above the poverty line despite the fact that medicaid is a federally mandated program there is a large amount of latitude as to the number and types of individuals and services that each state can choose to cover this state freedom implies that there are basically 51 different medicaid programs in the united states washington d c also participates in medicaid because of this there is a large variance in per recipient medicaid expenditures across states in 1992 for example annual per recipient medicaid expenditures for afdc adults ranged from a high of 2 937 in louisiana to a low of 575 in mississippi 1 recently economists and other social scientists have used the cross state variation in these programs as a form of natural experiment that allows them to access the effectiveness and adverse incentive effects of these programs in this article we use this approach to add to the literature on the effects of these programs on labor supply first we construct three new measures of the value of medicaid benefits to adults children and families which vary across states and time these alternate measures will allow us to test for the sensitivity of the conclusions from previous studies to the measure of medicaid value used previous work on medicaid and female labor supply has used measures of state level medicaid spending which included spending on the elderly and disabled since these groups account for a substantial share of all medicaid expenditures and they are not randomly distributed across states this has the potential to bias the reported results second because there is substantial variation acr oss states in their labor market characteristics demographic mixes and other factors which are potentially correlated with both labor supply and benefit generosity our analysis checks for the sensitivity of the results to the inclusion of state fixed and random effects

for love or money the impact of income taxes on marriage higher sometimes lower than their combined single income tax obligations in this paper we explore the impact of the federal individual income tax as well as other economic and demograplhic variables on the marriage decisionis of individuals using longitudinal data from the panel study on income dynamics for the period 1968 92 we estimate a discrete time hazard model of the time to first marriage we find that the probability of marriage is significantly affected by a range of economic and demographic variables importantly we find that an increase in total income taxes paid by married versus single women has a negative effect on the likelihood of marriage and that the change in the marginal tax rate is also a significant determinant of marriage in some cases in contrast the tax effects are rarely significant in determining marriage probabilities among men although there are some differential responses by race in general the impacts of the income tax variables even when statistically significant are small

a guide to health care reform there are four rationales for health care reform increasing the efficiency of health delivery reforming the market for health insurance providing universal coverage and reducing the federal deficit these goals are reflected in most reform proposals achieving these goals involves several problems however paying for universal coverage may lead to labor supply or demand reductions in addition reform involves large federal risks that must be dealt with through deficit financing reduced benefits or lower subsidies

public health insurance expansions and labour supply of married women the state children s health insurance programme while the relationships between health insurance and the labour supply of women have been explored in the literature little is known about the effects of offering public health insurance on the labour supply decisions of married women this article examines the labour supply decisions of married women using the state children s health insurance programme our empirical analysis implies that certain groups of married women may be leaving the labour force in order to provide public health insurance for their children we conclude that the programme causes unexpected efficiency losses through distorted labour supply decisions

the spillover effects of state spending abstract this paper estimates the extent to which state spending is influenced by the spending of neighboring states examining several different metrics of neighborliness in order to better identify the channels for interstate spillovers it improves on previous studies by taking advantage of exogenous shocks to state medical spending to abstract from correlated local conditions and by allowing for spatial autocorrelation focusing on mandated increases in medical spending the analysis shows that each dollar of state spending causes spending in neighboring states to increase by almost 90 cents the most predictive measure of neighborliness is the degree of population mobility between states suggesting that rational concerns about adverse migration may drive the interdependence of state spending policy

how income transfer programs affect work savings and the income distribution a critical review for helpful comments on earlier drafts we thank without implicating moses abramovitz yves balcer john bishop alan blinder richard burkhauser michael darby irwin garfinkel alan gustman daniel hamermesh martin holmer george jakubson robert lampman paul menchik robert moffitt michael murray joseph quinn timothy smeeding eugene smolensky barbara wolfe and two anonymous referees

the impact of state economic differentials on household welfare and labor force behavior abstract this paper calculates state specific income expectations for low income households using a simultaneous model of household labor force and welfare participation decisions a variety of simulations indicate the interlocking effects of existing state differences in welfare wages and taxes on work welfare choices and income significant differences among similar households in different states occur equalization of welfare benefits eliminates some but not all of these differences but generates potentially serious policy problems for the states

the effect of health insurance on married female labor supply we investigate the effects of employer provided health insurance on the labor supply of married women because health benefits commonly are restricted to full time workers wives who prefer to work short hours but have no alternate source of insurance may work long hours in order to acquire coverage for their families we use data from the april 1993 current population survey benefits supplement and we exploit variation in coverage under husbands health plans to estimate the magnitude of this effect our reduced form labor supply models indicate a strong negative effect of husbands health insurance on wives work hours particularly in families with children this effect persists when we replace husbands insurance coverage with husbands offered insurance and when we use a multinomial logit model that accounts for unobserved heterogeneity in family labor supply preferences

cash welfare as a consumption smoothing mechanism for divorced mothers abstract while there has been considerable research on the disincentive effects of cash welfare under the aid to families with dependent children afdc program there is little evidence on the benefits of the program for single mothers and their children one potential benefit of this program is that it provides short run consumption insurance for women at the point that they become single mothers this is only true however to the extent that the program is not crowding out other sources of support such as own savings labor supply or transfers from others i assess the importance of this insurance mechanism by measuring the extent to which afdc smooths the consumption of women who transition to single motherhood through marital dissolution i use longitudinal data on family structure and consumption expenditures on food and housing from the panel study of income dynamics psid matched to information on the welfare benefits available in each state and year over the 1968 1985 period i find that raising potential benefits by one dollar raises the food and housing consumption of women who get divorced and their families by 28 cents this estimate implies that for each dollar of afdc received by this population their consumption of these categories of goods rises by up to 51 cents this is roughly the share of food and housing in the consumption bundle of divorced mothers and their families suggesting little crowdout of other sources of support

implications of market mediated emissions and uncertainty for biofuel policies abstract biofuel policies affect global agricultural and oil commodity markets whose response has consequences for greenhouse gas ghg emissions estimates of the net ghg impact of biofuel policies are wide ranging and shrouded in uncertainty we perform a monte carlo experiment using a stylized model of the global liquid fuel market and compare different biofuel policies with respect to global ghg emissions and global oil consumption taking iluc emissions into consideration we find that for the currently commercial biofuels inclusion of iluc emissions as part of the policy rating of biofuels ghg intensity i likely leads to lower emissions ii leads to greater reduction in both domestic and global oil consumption iii leads to higher price of fuels in the home region all compared to when iluc emissions are excluded from the policy rating and iv does not however ensure that emissions absolutely decline owing to fuel market effects which unlike iluc are presently excluded from all existing fuel ghg regulations sensitivity analysis suggests that iluc emissions and the price elasticity of oil supply are the greatest contributors to variance in net global ghg emissions under any given policy

does welfare play any role in female headship decisions abstract previous studies have examined whether the welfare system has contributed to the dramatic increase in single parent families this paper explores why the results in this literature are sensitive to the presence of state fixed effects it considers one natural explanation namely that the composition of the population differs across states in ways that are related to welfare program generosity after controlling for individual effects the results provide no evidence that welfare raises the propensity to form female headed households for either whites or blacks these results illustrate the potential pitfalls of assuming that state factors are fixed over a long period of time they also suggest that previous studies may have overstated the effect of welfare programs on family structure

the effects of welfare vehicle asset rules on vehicle assets before 1996 households were typically ineligible for welfare if they had assets worth more than 1000 where 1500 from each vehicle s value was excluded from this determination however the 1996 welfare reform act began allowing states to increase their asset limits and vehicle exclusions this may prompt low income households to reallocate resources to or from vehicles we examine the effects of state vehicle asset rules on vehicle assets results show that liberalizing asset rules increases vehicle assets and that this increase is driven largely by eligible individuals increasing vehicle assets with no evidence indicating that ineligible individuals reduce vehicle assets to become eligible

marriage divorce and reciprocity based cooperation this paper considers partnership formation partnership dissolution and reciprocity based cooperation by couples in the form of voluntary transfers to smooth consumption while risk sharing is one benefit of having a partner it is also limited by the endogenous risk of separation the equilibrium formation and dissolution of partnerships are determined simultaneously with cooperative behavior publicly provided earnings insurance is shown to increase the turnover rate in the marriage market as well as to reduce the steady state marriage rate and the implicit financial cooperation between partners

is there an effect of incremental welfare benefits on fertility behavior a look at the family cap this analysis exploits the variation across states in the timing of policy implementation to determine if family cap policies lead to a reduction in births to women aged 15 to 34 vital statistics birth data for the years 1989 to 1998 offer no such evidence the data reject a decline in births of more than one percent the finding is robust to multiple specification checks the data also reject large declines in higher order births among demographic groups with high welfare participation rates

an economic model of welfare stigma perhaps the most basic assumption of the economic theory of consumer demand is that more is better than less virtually all of the major propositions of consumer theory can in a certain sense be derived from the assumption that goods are good interestingly however this tenet seems to be violated by the behavior of many individuals in the low income population for many turn out to be eligible for a positive welfare benefit but do not in fact join the welfare rolls for example it has been estimated that in 1970 only about 69 percent of the families eligible for afdc aid to families with dependent children participated in the program see richard michel 1980 the corresponding percentage for afdc u the program for which families with an unemployed male are eligible was only 43 percent and the participation rate in the food stamp program was only 38 percent see maurice mcdonald 1977 this phenomenon has puzzled many investigators because such individuals do not locate on the boundaries of their budget sets consequently most investigators ignore the problem when studying the effects of welfare programs on behavior in this paper this seemingly irrational rejection of an increase in income is modeled as resulting from welfare stigma that is from disutility arising from participation in a welfare program per se 1 the existence of stigma has been amply documented in the sociological literature patrick horan and patricia austin 1974 lee rainwater 1979 where interviews of recipients have often uncovered feelings of lack of self respect and negative self characterizations from participation in welfare nevertheless this phenomenon has not been modeled and many questions consequently remain when is the disutility of participation strong enough to prevent participation shouldn t we expect individuals to weigh the disutility of participation against the potential benefit in their decisions what is the elasticity of participation with respect to the potential benefit also in a slightly different vein how are the work disincentives of welfare affected by stigma these questions have been given scant attention by economists yet they are crucial for our ability to predict the impact of various welfare programs on the lowincome population here these questions are addressed by modeling nonparticipation as a utility maximizing decision the model is developed and estimated for the afdc program 2 the model posits an individual utility function containing not just disposable income but

the american welfare system and family structure an historical perspective cross sectional studies find a positive relationship between a state s welfare benefits and single motherhood but is this evidence of a welfare effect or rather of cross state differences in social attitudes that influence both policy and behavior this paper demonstrates that the spatial variation in welfare policy long preceded the spatial correlation of policy and behavior undermining the social norm hypothesis but the findings also raise doubts about the role that welfare policy played in the changes in family structure over the century the correlation between welfare benefits and family structure only appears in 1970 and then only for whites

children as income producing assets the case of teen illegitimacy and government transfers this paper develops a classical model of the teen fertility decision in the presence of public income transfers the theoretical model predicts that welfare payments will encourage fertility holding constant other economic opportunities and that better economic opportunities will discourage fertility considering the possible simultaneity of illegitimacy rates and benefit levels due to the collective choice process the authors confirm the theoretical models predictions with state level data from 1980 through 1990 the authors find that including fixed effects in the regression to control for unobserved differences between states does not sufficiently control for endogeneity after controlling for endogeneity real welfare benefits are strongly and robustly related to teen illegitimacy the point estimates of the elasticity with respect to changes in the illegitimacy rate are around 1 3 for white teens and 2 1 for black teens real wages for women with a high school education or less are negatively related to teen illegitimacy for white teens with an elasticity of around 0 4 finally male wages appear to have little effect on the illegitimacy rate for white teens but appear negatively correlated with the illegitimacy rate for black teens in some model specifications authors

government decision making and the incidence of federal mandates abstract this paper analyzes the effects of federally mandated program changes on state spending and revenues incorporating and evaluating the predictive value of several common theories of the state decision making process using several sources of exogenous increases in public medical spending i estimate that the entire state portion of the burden of mandated spending is borne by decreases in other public welfare spending while federal mandates may influence the composition of benefits at the state level it is much more difficult for them to change the total level of state transfers comparison of state reactions to different shocks suggests that these reductions are due in part to the substitutability of programs in the voter utility function but also in part to the stickiness of spending within budget categories states with greater racial differences between recipients and voters and states with less generous neighbors reduce other public welfare spending by even more alleviating the burden the medical expansions imposed on their taxpayers mandates may thus serve only to increase inequality across states

technical efficiency in developing country agriculture a meta analysis abstract a meta analysis is performed to review empirical estimates of technical efficiency te in developing country agriculture the objective of the study is to contribute to a better understanding of the factors that influence estimates of mean te a data set of 51 observations of te from 32 studies is used in order to test if specific characteristics of the data and econometric specifications account for systematic differences in the efficiency estimates results using the two limit tobit procedure indicate that factors such as primal versus dual number of fixed inputs and number of variable inputs increase average te estimates on the other hand using the cobb douglas functional form and cross sectional data yields a lower level of te other factors including the number of variables in the model crop type stochastic versus deterministic frontiers and sample size do not seem to significantly affect estimates of te across studies

tax incentives and the decision to purchase health insurance evidence from the self employed the tax reform act of 1986 introduced a new tax subsidy for health insurance purchases by the self employed we analyze the changing patterns of insurance demand before and after tax reform to generate new estimates of how the after tax price of insurance affects the discrete choice of whether to buy insurance we employ both traditional regression models and difference in difference methods that compare changes in insurance coverage across groups around tra86 the results from our most carefully controlled comparison suggest that a 1 percent increase in the cost of insurance coverage reduces the probability that a self employed single person will be insured by 1 8 percentage points

welfare the earned income tax credit and the labor supply of single mothers during 1984 1996 welfare and tax policy were changed to encourage work by single mothers the earned income tax credit was expanded welfare benets were cut welfare time limits were added and welfare cases were terminated medicaid for the working poor was expanded as were training programs and child care during this same time period there were unprecedented increases in the employment and hours of single mothers we show that a large share of the increase in work by single mothers can be attributed to the eitc and other tax changes with smaller shares for welfare benet cuts welfare waivers training programs and child care programs

the effect of social security on labor supply a cohort analysis of the notch generation this article uses aggregate birth year calendar year level data derived from the current population survey cps to estimate the effect of social security wealth on the labor supply of older men in the 1970s and 1980s the analysis focuses on measuring the impact of the 1977 amendments to the social security act which created a substantial unanticipated reduction in social security wealth for individuals born after 1916 this differential in benefits has become known as the benefit notch results indicate that labor supply continued to decline for the notch babies who received lower social security benefits than earlier cohorts

the impact of the rebound effect of the use of first generation biofuels in the eu on greenhouse gas emissions a critical review an important objective of the mandated blending of biofuel in conventional gasoline and diesel in the eu is reducing greenhouse gas ghg emissions an important assumption thereby is that biofuels replace the production and consumption of oil however recent literature challenges this assumption because an increased use of biofuels will lower oil prices and therefore result in increase crude oil consumption this so called rebound effect offsets the expected ghg emission saving effects of using biofuels a review of eight studies mainly on current and future us biofuel policies provides insights in the current state of research into this topic showing a wide range of values of the rebound effect of biofuel use depending among others on the biofuel policy the applied method and the model parameter assumptions generally estimated rebound effects are negative in the country where biofuel use is being promoted i e the use of 1 unit of biofuel reduces oil consumption by less than 1 unit units on energy basis the rebound effects in other countries are always positive biofuel use reduces oil consumption by less than 1 unit so the total fuel consumption is increasing the net global rebound effect is usually positive which means that ghg emissions savings are not achieved as much as usually is assumed or emissions may even increase own estimations with the global magnet computable general equilibrium model indicate a global rebound effect of the 10 biofuel blend mandate in the eu in the year 2020 of 22 30 i e the use of 1 unit of biofuel reduces global oil consumption by 0 78 0 70 units this means that ghg emissions will not be reduced as much as usually is assumed or may even increase these results show that rebound effects can significantly lower the effectiveness of biofuel policies in reducing ghg emissions

did expanding medicaid affect welfare participation in a widely cited 1995 paper aaron yelowitz concluded that medicaid eligibility expansions for children were associated with increased labor force participation and reduced welfare participation among single mothers the authors of the present study using data from the 1988 96 current population surveys re examine the evidence presented by yelowitz they find that yelowitz s results resulted from two factors he imposed a restriction on the parameter estimates not predicted by theory and rejected in the data and he used only one of two income tests that families must pass to be eligible for welfare the authors conclude that there is no evidence detectable in the cps data of a relationship between welfare or labor force participation and the medicaid income limits

the effects of work conditioned transfers on marriage and child well being a review transfer payments to poor families are increasingly conditioned on work although the effects of such programmes on employment are fairly well understood relatively little is known about their effects on marriage or child well being we review a few studies that provide such information here we sketch a theoretical model that draws from the efficient household literature the model is consistent with the wide range of effects that we observe and suggests an explanation for some of the observed differences our theoretical framework likewise explains the observed variation in the effects of such programmes on children social insurance payments increasingly take the form of conditional cash transfers requiring certain types of behaviour from recipients in order to qualify for aid in developed countries the conditions generally take the form of work requirements the american temporary aid to needy families tanf programme requires most recipients to work at least part time benefits from the american earned income tax credit eitc are available only to consumers who work the british working tax credit wtc is available only to consumers who work at least 16 hours per week and the canadian self sufficiency programme ssp which ran during the 1990s provided an earnings supplement to welfare recipients who were willing to leave the dole and take a full time job

the impact of welfare benefits on the conjugal status of single mothers in canada estimates from a hazard model this paper focuses on the determinants of the likelihood of a remarriage marriage for female heads with children using retrospective data from statistics canada s 1990 family history survey the study attempts to identify which socioeconomic characteristics of single mothers are conducive to conjugal union formation formal or informal particular attention is given to external time varying economic covariates so as to disentangle the impact they exert on single mothers propensity to start living with a new partner the empirical analysis is carried out using a proportional hazards model which permits the estimation of the effects of various covariates on the hazard of exiting single parenthood the most striking result is the strong effect of provincial welfare benefits on conjugal union formation however the analysis reveals that single motherhood far from representing a final state remains a transitory situation for a majority of women

health insurance and the labor supply decisions of older workers evidence from a u s department of veterans affairs expansion this paper exploits a major mid 1990s expansion in the u s department of veterans affairs health care system to provide evidence on the labor market effects of expanding health insurance availability using data from the current population survey we employ a difference in differences strategy to compare the labor market behavior of older veterans and non veterans before and after the va health benefits expansion to test the impact of public health insurance on labor supply we find that older workers are significantly more likely to decrease work both on the extensive and intensive margins after receiving access to non employer based insurance workers with some college education or a college degree are more likely to transition into self employment a result consistent with job lock effects however less educated workers are more likely to leave self employment a result suggesting that the positive income effect from receiving public insurance dominates the job lock effect for these workers some relatively disadvantaged sub populations may also increase their labor supply after gaining greater access to public insurance consistent with complementary positive health effects of health care access or decreased work disincentives for these groups we conclude that this reform has affected employment and retirement decisions and suggest that future moves toward universal coverage or expansions of medicare are likely to have significant labor market effects

the demand for hours of labor direct evidence from california california s longstanding requirement that most women receive time and a half pay for workhours beyond eight in one day was extended to men in 1980 analyzing current population survey data from 1973 1985 and 1991 we find that this overtime penalty substantially reduced the amount of daily overtime worked by california men relative to men in other states comparisons that use women to control for california specific shocks show even stronger effects the estimates imply a price elasticity of demand for overtime hours of at least 20 5

female labour supply and household employment shocks maternity leave as an insurance mechanism this paper investigates the role of unpaid maternity leave in providing household insurance against paternal employment shocks the main outcome is the timing of a mothers return to work after having a child exploiting the us family and medical leave act we find that mothers eligible for maternity leave speed up their return to work in response to a paternal shock with the conditional probability of being in work 49 higher than in households with no unpaid maternity leave further evidence is provided on the insurance role of unpaid maternity leave through i no significant interaction between paid maternity leave and the paternal shock and ii smoothing of consumption effects of the shock for households covered by unpaid leave

taxes and transfers their effects on the decision to end a marriage abstract the transfer system typically has large marriage disincentives while the income tax system is likely to subsidize marriage for many low income families in other words the tax system may offset an increase in transfer benefits associated with marital separation the interaction of the transfer system with the income tax system has largely been overlooked the income tax system has become more relevant for low income families with the recent expansion of the earned income tax credit which filers may be eligible for even if their tax liability is zero this paper uses family level measures of the change in transfer benefits and tax liability associated with a change in family structure to consider the effect of these financial incentives on separation decisions

welfare effects on female headship with area effects the existing literature on welfare effects on female headship in the united states shows significant positive correlations in cross section possibly increasing over time however when geographic or area effects are permitted in the estimation these correlations either disappear or reverse in sign the results have implications for the study of welfare effects in other countries including canada where benefits vary considerably across provinces and localities within them

the incidence of mandated maternity benefits i consider the labor market effects of mandates which raise the costs of employing a demographically identifiable group the efficiency of these policies will be largely dependent on the extent to which their costs are shifted to group specific wages i study several state and federal mandates which stipulated that childbirth be covered comprehensively in health insurance plans raising the relative cost of insuring women of childbearing age i find substantial shifting of the costs of these mandates to the wages of the targeted group correspondingly i find little effect on total labor input for that group jel 118 j32 h51 in an era of tight fiscal budget constraints mandating employer provision of workplace benefits to employees is an attractive means for a government to finance its policy agenda consequently in recent years there has been a growth of interest in mandated benefits as a tool of social policy for example the centerpiece of president bill clinton s health care proposal is mandated employer provision of health insurance and more than 20 states have man

snap expansions and participation in government safety net programs this paper investigates the interactions between health and nutritional assistance programs such as medicaid snap wic and school lunch programs exploiting variation in snap eligibility across states and over time i find strong evidence of program interactions when a state moves from the federal rule to the most extensive snap eligibility rule enrollment in free school lunch and wic increases by 4 1 and 7 9 percentage points respectively i estimate that the federal government spends an additional 74 cents on the school lunch program and wic for each dollar spent on snap due to the expansion

the market and consumer welfare effects of mid level ethanol blends in the us fuel market abstract this study examines the prospect that a consumer driven market could eventually replace the myriad regulations and demand quotas in the us ethanol and gasoline fuel market given efficient households that minimize the cost of operating automobiles recent vehicle technology that improves blended fuel substitution and typical market conditions of the last five years blended fuels with 20 ethanol concentration could occupy a volume of 82 2 billion gallons in a 138 3 billion gallon gasoline market the consumer welfare gain associated with blended fuel is 15 9 billion annually for us consumers or about 1000 over the life of a vehicle the ethanol demand associated with a voluntary blended fuel market is 16 4 bgy slightly more than the conventional component of the renewable fuels standard it is time to replace the corn rfs with a free market but an active competition policy in the fuel marketing system may also be required intervention for the impending biomass ethanol industry such as a subsidy or an exemption a carbon tax may also be in order

marital status and fertility in the united states welfare and labor market effects the incidence of marriage and the proportion of childbearing that occurs within marriage have decreased sharply in the united states in the last several decades this paper examines whether the probability that a woman is currently married and the number of children she has borne as reported in the 1980 u s census are related to two identifiable factors the variation in welfare programs across states specifically afdc and medicaid benefits and afdc up expenditures or the variation in the market wage opportunities available to women and to their potential husbands afdc and medicaid benefit levels are associated with fewer women being currently married medicaid benefits are related to lower fertility levels for both black and white women whereas afdc benefits in cash and food are associated with lower fertility among white women ages 15 24 those states that extend afdc benefits to families with unemployed parents in other words fathers in intact poor families do not have significantly more women married or higher fertility rates contrary to what might be expected from economic incentives men s market wages are associated with more frequent marriage and higher fertility whereas higher market wage opportunities for women have substantial effects in the opposite direction all of which are consistent with standard models of gender specialization and the demand for marriage and fertility

socio economic status and child health does public health insurance narrow the drawing on evidence from the u s this paper examines the effects of public health insurance on children recent expansions of american public health insurance programs to previously ineligible children have created a great deal of variation that can be used to identify their effects results indicate that providing public insurance to poor children narrows socio economic gaps in utilization and health among children however inefficiencies and inequities in the allocation of health care remain which suggests that universality and outreach programs are also important components of the public health systems common in europe

us biofuels subsidies and co2 emissions an empirical test for a weak and a strong green paradox abstract using energy data over the period 1981 2011 we find that us biofuels subsidies and production have provided a perverse incentive for us fossil fuel producers to increase their rate of extraction that has generated a weak green paradox further in the short run if the reduction in the co 2 emissions from a one to one substitution between biofuels and fossil fuels is less than 26 percent or less than 57 percent if long run effect is taken into account then us biofuels production is likely to have resulted in a strong green paradox these results indicate that subsidies for first generation biofuels which yield a low level of per unit co 2 emission reduction compared to fossil fuels might have contributed to additional net co 2 emissions over the study period

effects of us biofuel policies on us and world petroleum product markets with consequences for greenhouse gas emissions abstract us biofuel policy includes greenhouse gas reduction targets regulators do not address the potential that biofuel policy can have indirect impacts on greenhouse gases through its impacts on petroleum product markets and scientific research only partially addresses this question we use economic models of us biofuel and agricultural markets and us and world petroleum and petroleum product markets to show that discontinuing biofuel tax credits and ethanol tariff lower biofuel use could lead to increased us petroleum product use and a reduction in petroleum product use in other parts of the world the net effect is lower greenhouse gas emissions under certain assumptions we show that biofuel use mandate elimination can have positive or negative impacts on greenhouse gas emissions the magnitude and the direction of effects depend on how us biofuel trade affects biofuel in other countries with different emissions context that determines how important use mandates are in the first place who pays mandate costs and the price responsiveness of global petroleum supplies and uses however our results show that counter intuitive effects are possible and discourage broad conclusions about the greenhouse gas impacts of removing these elements of us biofuel policy

substitution between biofuels and fossil fuels is there a green paradox we show that i subsidies for renewable energy policies with the intention of encouraging substitution away from fossil fuels may accentuate climate change damages by hastening fossil fuel extraction and that ii the opposite result holds under some specified conditions we focus on the case of subsidies for renewable resources produced under increasing marginal costs and assume that both the renewable resources and the fossil fuels are currently in use such subsidies have a direct effect and an indirect effect working in opposite directions the direct effect is the reduction in demand for fossil fuels at any given price the indirect effect is the reduction in the current equilibrium price for fossil fuels which tends to increase the amount of fossil fuels demanded whether the sum of the two effects will actually result in an earlier or later date of exhaustion of the stock of fossil fuels depends on the curvature of the demand curve for energy and of the supply curve for the renewable substitute

welfare effects on the marital decisions of never married mothers the economic theory of marriage suggests that more generous welfare benefits should serve to reduce the probability of marriage among mothers who have given birth out of wedlock this relationship is explored using data on never married mothers in the national longitudinal survey of youth only very limited evidence indicates that higher welfare payments lower the probability of marriage for nonblack never married mothers for black never married mothers the results suggest that higher benefits are associated with higher marriage rates

the socioeconomic consequences of in work benefit reform for british lone mothers in october 1999 the british government enacted the working families tax credit which aimed at encouraging work among low income families with children this paper uses panel data collected between 1991 and 2001 to evaluate the effect of this reform on single mothers we find that the reform led to a substantial increase in their employment rate of about five percentage points which was driven by both a higher rate at which lone mothers remained in the labor force and a higher rate at which they entered it women s responses were highly heterogeneous with effects double this size for mothers with one preschool aged child and virtually no effect for mothers with multiple older children the employment increase was accompanied by significant increases in paid childcare utilization and our analysis in fact suggests that the generous childcare credit component of the reform played a key role in explaining the estimated employment and childcare usage responses we also find that the increase in labor market participation was accompanied by reductions in single mothers subsequent fertility and in the rate at which they married behavioral responses which in turn are likely to influence the reform s overall impact on child poverty and welfare

frontier production functions and technical efficiency a survey of empirical applications in agricultural economics abstract the modelling and estimation of frontier production functions has been an important area of econometric research during the last two decades forsund lovell and schmidt 1980 and schmidt 1986 present reviews of the concepts and models involved and cite some of the empirical applications which had appeared to their respective times of publication this paper seeks to update the econometric modelling of frontier production functions associated with the estimation of technical efficiency of individual firms a survey of empirical applications in agricultural economics is an important part of the paper

effective tax rates and guarantees in the afdc program 1967 1982 estimates of effective tax rates on earned and unearned income and estimates of effective guarantees in the afdc program by state are provided for the period 1967 1982 the results indicate that effective real guarantees fell every year from 1967 to 1981 but stabilized in 1982 effective tax rates on unearned income rose steadily from 1967 to 1981 and took a particularly large additional jump in 1982 effective tax rates on earned income fell after 1967 but then gradually rose throughout the 1970s until 1982 when they took a much larger jump thus guarantees fell and tax rates rose over the 1970s as tight budgets forced states to restrict benefits and in the early 1980s tax rates were pushed even higher by federal legislation

the consumption effects associated with filing for personal bankruptcy this article examines the response of food consumption to filing for personal bankruptcy in the spirit of previous work on the benefits of other social insurance programs using the panel study of income dynamics psid we find that an increase in the financial benefit to filing for bankruptcy increases the growth in food consumption in addition we find that filing under chapter 7 of the bankruptcy code provides consumption insurance while filing under chapter 13 of the bankruptcy code provides no significant consumption benefits personal bankruptcy in the united states is part of the social insurance structure provided by the federal and state governments other programs in this network include but are not limited to unemployment insurance ui temporary assistance to needy families tanf and food stamps while these latter three programs are targeted to specific groups the recently unemployed for ui and low income households for tanf and food stamps personal bankruptcy is not much like these other programs though bankruptcy reduces income uncertainty and reduces wealth uncertainty surprisingly little work has been done on the direct benefits to filing for bankruptcy this is in contrast with the growing literature on the costs of bankruptcy 1 fay hurst and white 2002 estimate the financial benefit to filing for bankruptcy which equals the debt forgiven minus any lost assets this measure is a good predictor of whether the household files for bankruptcy but it is not clear that the financial benefit is the true measure of the welfare gain from bankruptcy in fact the financial benefit is most likely an overestimate of the household s gain in the year it files for bankruptcy unlike ui or tanf bankruptcy provides no increase in money income for that period but rather increases net of debt income this change is felt over the household s lifetime and filers will most likely smooth this effect over multiple years because households cannot file for bankruptcy again for six years further using the financial benefit makes it difficult to compare results against the

does means testing welfare discourage saving evidence from a change in afdc policy in the united states abstract this paper provides empirical evidence on the impact of a welfare program s asset test on the saving behavior of its target population the approach exploits a policy experiment the essential federalization of the afdc program s asset testing policy in 1981 data on female headed households from the national longitudinal survey young women are used to test the hypothesis that likely afdc users adjusted their asset stocks in response to this change the findings indicate additional saving between 1978 and 1983 of about 25 cents for each additional 1 increase in the limit in most states

why did the ssi disabled program grow so much disentangling the effect of medicaid the number of participants in the ssi program grew by 1 1 million from 1987 to 1993 this paper examines the role of medicaid on the ssi participation decision i use the rapid growth in average medicaid expenditure as a proxy for its value ols estimates of medicaid s effect may be biased because of omitted variables bias and measurement error i therefore apply two stage least squares to estimate medicaid s effect using average medicaid expenditure for blind ssi recipients as an instrument these estimates show that rising medicaid expenditure significantly increased ssi participation among adults with low permanent incomes explaining 20 of the growth

single women s labor supply elasticities trends and policy implications this paper uses cps data to examine changes in single women s labor supply elas ticities in recent decades specifically the authors investigate trends in how single women s hours of work and labor force participation rates responded to both wages and income over the years 1979 2003 results from the base specification suggest that over the observation period hours wage elasticities decreased by 82 participation wage elasticities by 36 and participation income elasticities by 57 these results imply that changes in tax policy had a much larger effect on the labor supply and labor force participation behavior of women in this subpopulation in the early 1980s than in recent years i t is well documented that over the past few decades female labor force behavior has undergone substantial changes women s labor force participation rates have increased markedly as have their annual hours of work at the same time the marital composition of women has undergone a substantial change as well with the proportion of married women falling steadily over time as a result single women comprise a greater share of the labor force than in earlier years and hence their behavioral responses to changes in wages and incomes carry even greater importance for the effects of changes in tax and transfer policies despite the large increase in the number of single women over the past decades single women s labor supply behavior has received

social assistance and conjugal union dissolution in canada a dynamic analysis using statistics canadas general social survey on family and friends carried out in 1990 we piece together the matrimonial and conjugal life history of a large sample of canadian men and women we then estimate duration models coxs proportional hazard models describing the evolutionary laws of marriages and unions which depend on various economic or socio demographic explanatory variables the empirical modelling focuses primarily on estimating the impact of couples earned incomes and of provincial welfare programs on the dissolution rate of first marriages and unions we find that welfare benefits do not have an impact on the hazard of union dissolution and that earned incomes have a positive effect on conjugal stability excerpt summary in fre

estimating the effect of financial aid offers on college enrollment a regression discontinuity approach an important problem faced by colleges and universities that of evaluating the effect of their financial aid offers on student enrollment decisions is complicated by the likely endogeneity of the aid offer variable in a student enrollment equation this article shows how discontinuities in an east coast college s aid assignment rule can be exploited to obtain credible estimates of the aid effect without having to rely on arbitrary exclusion restrictions and functional form assumptions semiparametric estimates based on a regression discontinuity rd approach affirm the importance of financial aid as an effective instrument in competing with other colleges for students

the effect of the u s welfare system on marital status abstract an issue of long standing importance in the u s welfare system has been its lack of neutrality with respect to family composition which generally provides payments only to female headed families that is families with no able bodied male present using data from 1969 to 1985 to examine the issue this study finds that 1 the simple cross sectional correlations between marital status and welfare benefits are almost always in the expected direction but are generally weak in significance 2 that the magnitude and significance of the correlations have nevertheless grown over time and 3 that the correlations for men are no weaker and usually stronger especially for blacks than those for women

will extending medicaid to two parent families encourage marriage several welfare programs in the united states restrict eligibility to single parent families this paper asks whether eliminating this restriction for medicaid encourages marriage i identify medicaid s effect through a series of health insurance reforms that were passed in the 1980s and 1990s targeting young children these reforms were associated with an increase in the probability of marriage of 1 7 percentage points while the expansions offered some incentives to become married they also created other incentives to become divorced known as the independence effect after controlling for the outflows from marriage due to the independence effect the estimated effect increases by 10 percent

the role of economic incentives in teenage nonmarital childbearing choices abstract in this paper we explore whether behaviors of youths that are likely to result in a teen nonmarital birth event are influenced by their expectations of the net economic benefits or costs associated with the occurrence of such a birth we posit and find that an increase in the perceived costs associated with the occurrence of a nonmarital birth would lead to a reduction in these risky behaviors and to a lower probability of a nonmarital birth event we represent these economic incentives by the income expectations of young women conditional on either giving birth as an unmarried teen or forgoing childbearing while unmarried and an adolescent we also measure the effects of an extensive list of other factors including the characteristics of the girl s family and its choices the social and economic environment in which she lives including policy related factors such as expenditures by states on family planning programs and the generosity of aid to families with dependent children and her own prior choices

the married widow marriage penalties matter marriage penalties are a controversial feature of many government policies empirical evidence of their behavioral effects is quite mixed which is surprising because economic theory predicts that they should have an impact on the headship decision we investigate the removal of marriage penalties from the surviving spouse pensions of the canadian public pension system in the 1980s these reforms provide a simple and transparent source of identification our results indicate that marriage penalties can have large and persistent effects on marriage decisions we also present evidence suggesting that it is individuals with characteristics correlated with greater wealth who respond to the penalties jel j1 h2

welfare marital prospects and nonmarital childbearing the roles of the entitlements of the afdc program and marital prospects in the fertility and marriage choices of young women are assessed in the context of a model incorporating heritable endowment heterogeneity assortative mating concern for child quality and potential parental and public support alternatives estimates based on data describing the fertility and marital experience up to age 23 of the eight birth cohorts of women in the nlsy provide evidence that higher afdc benefit levels and lower marital prospects induce young women to choose to have a child outside of marriage

immigration and welfare magnets this article investigates if the location choices made by immigrants when they arrive in the united states are influenced by the interstate dispersion in welfare benefits income maximizing behavior implies that foreign born welfare recipients unlike their native born counterparts may be clustered in the states that offer the highest benefits the empirical analysis indicates that immigrant welfare recipients are indeed more heavily clustered in high benefit states than the immigrants who do not receive welfare or than natives as a result the welfare participation rate of immigrants is much more sensitive to changes in welfare benefits than that of natives

climate consequences of low carbon fuels the united states renewable fuel standard abstract a common strategy for reducing greenhouse gas ghg emissions from energy use is to increase the supply of low carbon alternatives however increasing supply tends to lower energy prices which encourages additional fuel consumption this fuel market rebound effect can undermine climate change mitigation strategies even to the point where efforts to reduce ghg emissions by increasing the supply of low carbon fuels may actually result in increased ghg emissions here we explore how policies that encourage the production of low carbon fuels may result in increased ghg emissions because the resulting increase in energy use overwhelms the benefits of reduced carbon intensity we describe how climate change mitigation strategies should follow a simple rule a low carbon fuel with a carbon intensity of x that of a fossil fuel must displace at least x of that fossil fuel to reduce overall ghg emissions we apply this rule to the united states renewable fuel standard rfs2 we show that absent consideration of the fuel market rebound effect rfs2 appears to reduce ghg emissions but once the fuel market rebound effect is factored in rfs2 actually increases ghg emissions when all fuel ghg intensity targets are met