what drives deregulation economics and politics of the relaxation of bank branching restrictions this paper investigates private interest public interest and political institutional theories of regulatory change to analyze state level deregulation of bank branching restrictions using a hazard model we find that interest group factors related to the relative strength of potential winners large banks and small bank dependent firms and losers small banks and the rival insurance firms can explain the timing of branching deregulation across states during the last quarter century the same factors also explain congressional voting on interstate branching deregulation while we find some support for each theory the private interest approach provides the most compelling overall explanation of our results

measuring program impacts on earnings and employment do unemployment insurance wage reports from employers agree with surveys of individuals this article attempts to determine whether wage records reported by employers to state unemployment insurance ui agencies provide a valid alternative to more costly retrospective sample surveys o

women as policy makers evidence from a randomized policy experiment in india this paper uses political reservations for women in india to study the impact of women s leadership on policy decisions since the mid 1990 s one third of village council head positions in india have been randomly reserved for a woman in these councils only women could be elected to the position of head village councils are responsible for the provision of many local public goods in rural areas using a dataset we collected on 265 village councils in west bengal and rajasthan we compare the type of public goods provided in reserved and unreserved village councils we show that the reservation of a council seat affects the types of public goods provided specifically leaders invest more in infrastructure that is directly relevant to the needs of their own genders

betting on hitler the value of political connections in nazi germany this paper examines the value of connections between german industry and the nazi movement in early 1933 drawing on previously unused contemporary sources about management and supervisory board composition and stock returns we find that one out of seven firms and a large proportion of the biggest companies had substantive links with the national socialist german workers party firms supporting the nazi movement experienced unusually high returns outperforming unconnected ones by 5 to 8 between january and march 1933 these results are not driven by sectoral composition and are robust to alternative estimators and definitions of affiliation

a stochastic frontier model with endogenous treatment status and mediator government policies are frequently used to promote productivity some policies are designed to enhance production technology while others are meant to improve production efficiency an important i

the estimation of wage gains and welfare gains in self selection models the authors modify the basic self sele ction model for the effects ofeducation training unions and other activities on wages by including heterogeneity of rewards to the activity i e diffe rences across individuals in the rate of return to the activity the authors sho w that such heterogeneity creates a new form of selectionbias they provide tes ts for its presence and draw out its implications for the wage and welfare gains to the activity an empirical application provides strong support for such hete rogeneityin one particular training program copyright 1987 by mit press

assessing the case for social experiments rs ecent academic debates pit two alternative approaches to policy evaluation against one another the first is the experimental approach based on the random assignment of accepted program applicants to a recipient or treatment group and a non recipient or control group the second is the nonexperimental or econometric approach that uses a variety of microdata sources statistical methods and behavioral models to compare the outcomes of participants in social programs with those of nonparticipants the central question addressed in this paper is whether or not randomized social experiments aid in securing answers to basic questions about the evaluation of social programs there are many distinct and complementary approaches to the study of the impact of public policy including full general equilibrium analysis of policy impacts tinbergen 1956 auerbach and kotlikoff 1987 shoven and whalley 1992 kydland and prescott 1991 and less ambitious partial equilibrium microeconomic structural research programs such as those designed to estimate the impact of taxes on labor supply both approaches offer answers to many interesting counterfactual policy questions but their credibility rests critically on the quality of the empirical input used to generate their answers

estimating the effects of a time limited earnings subsidy for welfare leavers in the self sufficiency project ssp welfare demonstration members of a randomly assigned treatment group could receive a subsidy for full time work the subsidy was available for 3 years but only to people who began working full time within 12 months of random assignment a simple optimizing model suggests that the eligibility rules created an establishment incentive to find a job and leave welfare within a year of random assignment and an entitlement incentive to choose work over welfare once eligibility was established building on this insight we develop an econometric model of welfare participation that allows us to separate the two effects and estimate the impact of the earnings subsidy on welfare entry and exit rates among those who achieved eligibility the combination of the two incentives explains the time profile of the experimental impacts which peaked 15 months after random assignment and faded relatively quickly our findings suggest that about half of the peak impact of ssp was attributable to the establishment incentive despite the extra work effort generated by ssp the program had no lasting impact on wages and little or no long run effect on welfare participation

efficiency and environmental factors in the us electricity transmission industry the electricity industry in most developed countries has been restructured over recent decades with the aim of improving both service quality and firm performance regulated segments e g transmission still provide the infrastructure for the competitive segments and represent a significant share of the total price paid by final customers however there is a lack of empirical studies that analyse firms performance in the electricity transmission sector in this paper an empirical analysis of us electricity transmission companies is conducted for the period 2001 2009 we use alternative stochastic frontier models that allow us to identify the determinants of firms inefficiency these models also permit us to control for weather conditions potentially one of the most decisive uncontrollable factors in electricity transmission our results suggest that weather conditions clearly have an influence on transmission costs and that there is room for improvement in the management of us electricity transmission systems regulators should also be aware that more adverse conditions generate higher levels of inefficiency and that achieving long term efficiency improvements tends to worsen firms short term relative performance

pseudolikelihood estimation of the stochastic frontier model stochastic frontier analysis is a popular tool to assess firm performance almost universally it has been applied using maximum likelihood ml estimation an alternative approach pseudolikelihood

technology invention and diffusion in residential energy consumption a stochastic frontier approach traditional large appliances absorb a large share of residential electricity consumption and represent important targets of energy policy strategies aimed at achieving energy security despite being characterized by rather mature technologies this group of appliances still offers large potential in terms of efficiency gains due to their pervasive diffusion in this paper we analyse the electricity consumption of a set of four traditional white goods in a panel of ten eu countries observed over 21 years 1990 2010 with the aim of disentangling the amount of technical efficiency from the overall energy saving the technical efficiency trend is modelled through a set of technology components representing both the invention and adoption process by the means of specific patents weighted by production and bilateral import flows which allows to overcome the rigid stochastic frontier framework in modelling the effect of technical change our results show that the derived energy demand and inefficiency trends are both related to changes in the amount of available technology embodied in energy efficient appliances the effect is significant both in its domestic and international components and suggests an active role of innovation and trade policies for achieving efficiency targets which directly impact the amount of electricity consumed by households

estimation of input oriented technical efficiency using a nonhomogeneous stochastic production frontier model technical inefficiency can be modeled as either input oriented io or output oriented oo however in the estimation of parametric stochastic production frontier models which use maximum likelihood method only the oo measure is used in this article we consider a simple nonhomogeneous production function and estimate it with both io and oo specifications a sample of 80 spanish dairy data 1993 1998 is used to estimate both models we consider one output liters of milk and four variable inputs viz number of cows kilograms of concentrates hectares of land and labor measured in man equivalent units we find that returns to scale rts and technical efficiency results derived from these models are different because either estimated technologies are different or they are evaluated at different points using a monte carlo analysis we show that if rts is close to unity differences in the estimates of rts and technical efficiency are smaller this holds true for estimates of both rts and technical efficiency

who benefits from job corps a distributional analysis of an active labor market program summary using recently developed econometric techniques to estimate quantile treatment effects qte and experimental data we examine the impact of job corps on earnings distribution our results indicate a great deal of heterogeneity in the effects of job corps the qtes show an increasing pattern along the earnings distribution with much more pronounced differences at the upper quantiles for males whites and ages 20 24 moreover we find the qtes to be very small at quantiles below the median for males ages 16 17 and 18 19 and non resident students we propose strong economic conditions and skill hypotheses to explain the heterogeneity observed over the earnings distribution copyright 2013 john wiley sons ltd

the effects of youth employment evidence from new york city lotteries programs to encourage labor market activity among youth including public employment programs and wage subsidies like the work opportunity tax credit can be supported by three broad rationales they may i provide contemporaneous income support to participants ii encourage work experience that improves future employment and or educational outcomes of participants and or iii keep participants out of trouble we study randomized lotteries for access to the new york city nyc summer youth employment program syep the largest summer youth employment program in the united states by merging syep administrative data on 294 100 lottery participants to irs data on the universe of u s tax records to new york state administrative incarceration data and to nyc administrative cause of death data in assessing the three rationales we find that i syep participation causes average earnings and the probability of employment to increase in the year of program participation with modest contemporaneous crowdout of other earnings and employment ii syep participation causes a modest decrease in average earnings for three years following the program and has no impact on college enrollment and iii syep participation decreases the probability of incarceration and decreases the probability of mortality which has important and potentially pivotal implications for analyzing the net benefits of the program jel codes j13 j45 j38 j21

lifetime earnings and the vietnam era draft lottery evidence from social security administrative records errata the randomly assigned risk of induction generated by the draft lottery is used to construct estimates of the effect of veteran status on civilian earnings these estimates are not biased by the fact that certain types of men are more likely than others to service in the military social security administrative records indicate that in the early 1980s long after their service in vietnam had ended the earnings of white veterans were approximately 15 percent less than the earnings of comparable nonveterans copyright 1990 by american economic association

does job corps work impact findings from the national job corps study this paper presents findings from an experimental evaluation of job corps the nation s largest training program for disadvantaged youths the study uses survey data collected over four years and tax data over nine years on a nationwide sample of 15 400 treatments and controls the job corps model has promise program participation increases educational attainment reduces criminal activity and increases earnings for several postprogram years based on tax data however the earnings gains were not sustained except for the oldest participants nonetheless job corps is the only federal training program that has been shown to increase earnings for this population

market oriented institutions and policies and economic growth a critical survey this paper surveys recent evidence suggesting that market oriented institutions and policies are strongly related to economic growth focusing on studies using the economic freedom ef indicator of the fraser institute this index is critically discussed also various serious shortcomings of empirical studies using this index are identified nevertheless there are strong indications that liberalization i e an increase in the ef index stimulates economic growth this paper also reviews studies on the determinants of ef political liberalization is often found to enhance economic liberalization whereas there is less evidence for causality running in the other direction

farmer participation in supermarket channels production technology and efficiency the case of vegetables in kenya supermarkets are gaining ground in agrifood systems of many developing countries while recent research has analyzed income effects in the small farm sector impacts on productivity and efficiency have hardly been studied we use a meta frontier approach and combine this with propensity score matching to estimate treatment effects among vegetable farmers in kenya participation in supermarket channels increases farm productivity in terms of meta technology ratios by 45 we also find positive and significant impacts on technical efficiency and scale efficiency supermarket expansion therefore presents opportunities for agricultural growth in the small farm sector which is crucial for poverty reduction in africa copyright 2012 oxford university press

long run effects of youth training programs experimental evidence from argentina we study the effect of a job training program for low income youth in cordoba argentina the program included life skills and vocational training as well as internships with private sector employers participants were allocated by means of a public lottery we rely on administrative data on formal employment employment spells and earnings to establish the effects of the program in the short term 18 months but also exceptionally for programs of this type in latin america and in developing countries in general in the medium term 33 months and in the long term 48 months the results indicate sizable gains of about 8 percentage points in formal employment in the short term about 32 higher than the control group although these effects dissipate in the medium and in the long term contrary to previous results for similar programs in the region the effects are substantially larger for men although they also seem to fade in the long run program participants also exhibit earnings about 40 higher than those in the control group and an analysis of bounds indicates that these gains result from both higher employment levels and higher wages the detailed administrative records also allow us to shed some light on the possible mechanisms underlying these effects a dynamic analysis of employment transitions indicates that the program operated through an increase in the persistence of employment rather than from more frequent entries into employment the earnings effect and the higher persistence of employment suggest that the program was successful in increasing the human capital of participants although the transient nature of these results may also reflect better matches from a program induced increase in informal contacts or formal intermediation jel j08 j24 j68 o15

the interpretation of instrumental variables estimators in simultaneous equations models with an application to the demand for fish in markets where prices are determined by the intersection of supply and demand curves standard identification results require the presence of instruments that shift one curve but not the other these results are typically presented in the context of linear models with fixed coefficients and additive residuals the first contribution of this paper is an investigation of the consequences of relaxing both the linearity and the additivity assumption for the interpretation of linear instrumental variables estimators without these assumptions the standard linear instrumental variables estimator identifies a weighted average of the derivative of the behavioural relationship of interest a second contribution is the formulation of critical identifying assumptions in terms of demand and supply at different prices and instruments rather than in terms of functional form specific residuals our approach to the simultaneous equations problem and the average derivative interpretation of instrumental variables estimates is illustrated by estimating the demand for fresh whiting at the fulton fish market strong and credible instruments for identification of this demand function are available in the form of weather conditions at sea

a stochastic frontier analysis of financing constraints on investment is shown that investment under financing constraints can be modeled as a one sided deviation from a frictionless investment level and that effects of financing constraints can be identified and quantified by imposing a distributional assumption on the effects panel data on taiwanese manufacturing firms between 1989 and 1996 are used in the estimation it is found that 1 some of the sorting criteria used in the literature do not have significant and monotonic relationships with the degrees of financing constraint resulting in problematic sample separations and 2 the effects of financial liberalization in taiwan are such that the investment efficiency improved over time for a typical firm and the improvement was particularly large for smaller firms

imperfectly enforceable labour contracts this paper presents a model where firms offer workers azariadian type labour contracts most workers abide by these contracts but some who have very small moving or retraining costs violate contractual agreements whenever higher wages are available on labour spot markets it is shown that the wilson equilibrium for this model can be pareto dominated by an outcome where mobility is restricted appropriately we give a simple classification for the set of economies where wilson equilibria are constrained pareto optima a propos de contrats de travail dont on ne peut faire appliquer les termes qu imparfaitement ce memoire presente un modele oui les entreprises offrent aux travailleurs des contrats de travail du type azariadis la plupart des travailleurs honorent ces contrats mais certains travailleurs pour qui les couts de deplacement et de recyclage sont faibles ne vont pas honorer leurs engagements quand le niveau de salaire est plus eleve sur le marche ferme que dans le contrat on montre que l equilibre de wilson dans un tel modele peut etre inf6rieur au sens de pareto a une solution impliquant certaines restrictions appropriees a la mobilite on propose une classification simple s appliquant a 1 ensemble des economies pour lesquelles les equilibres de wilson sont des optima paretiens sous contraintes

heteroscedasticity or production risk a synthetic view two veins of literature namely production risk literature and stochastic frontier analysis are examined both fields are concerned of output variation the former due to exogenous shocks the latter due inefficiency by covering the literature from both the fields this review suggests that the concept of heteroscedasticity can be utilized to build a synthesis between these mainly separate branches of literature however the synthetic approach brings a challenge how to differentiate between different sources of output variation this challenge is identified as the main obstacle to meaningfully combine the two approaches

the effects of housing assistance on labor supply evidence from a voucher lottery this study estimates the effects of means tested housing programs on labor supply using data from a randomized housing voucher wait list lottery in chicago economic theory is ambiguous about the expected sign of any labor supply response we find that among working age able bodied adults housing voucher use reduces labor force participation by around 4 percentage points 6 percent and quarterly earnings by 329 10 percent and increases temporary assistance for needy families program participation by around 2 percentage points 15 percent we find no evidence that the housing specific mechanisms hypothesized to promote work such as neighborhood quality or residential stability are important empirically jel i38 j22 r23 r38

the effects of job corps training on wages of adolescents and young adults previous evaluations of job corps document disparate effects on the earnings of adolescents aged 16 19 and young adults aged 20 24 these are conjectured to be due to differential human capital accumulation within the program between these groups if correct the effect of the program on wages should be larger than that on earnings since wages more accurately reflect human capital we estimate bounds on average and quantile treatment effects of job corps on wages and find that the relative effects on both outcomes are similar casting some doubt on the conjecture that human capital is driving the disparate effects

innovative performance effects of institutional quality an empirical investigation from the triad using data for a set of 823 r d intense manufacturing firms within the triad and the quality of government qog dataset over the 2002 2010 period this article investigates the effects of institut

evaluating the econometric evaluations of training programs with experimental data this paper takes the results of an employment and training program thatwas run as a field experiment in which the participants were randomlyassigned into a treatment or a control group and compares these results to the estimates that might have been produced by an econometrician who evaluated the program using the same econometric procedures that have been used in the program evaluation literature this comparison shows that many of these econometric procedures fail toreplicate the experimentally determined results and suggests that researchers should be aware of the potential for specification errorsin other nonexperimental evaluations copyright 1986 by american economic association

costs of nitrogen runoff for rural water utilities a shadow cost approach this paper explores the interactions among scale and density economies productive efficiency water quality and customer characteristics and their impact on the costs of delivering treated drinking water implicit benefits of nitrogen abatement are also derived and hypothesis tests concerning their hypothesized drivers are conducted key findings are that nitrogen removal costs increase with rising raw water nitrogen concentration coming from agricultural activities and that network density and system size matter in determining average total costs of community water systems merging water systems to take advantage of scale economies may be difficult due to the heterogeneity of the sector however

quantile regression for robust bank efficiency score estimation abstract we discuss quantile regression techniques as a robust and easy to implement alternative for estimating farell technical efficiency scores the quantile regression approach estimates the production process for benchmark banks located at top conditional quantiles monte carlo simulations reveal that even when generating data according to the assumptions of the stochastic frontier model sfa efficiency estimates obtained from quantile regressions resemble sfa efficiency estimates we apply the sfa and the quantile regression approach to german bank data for three banking groups commercial banks savings banks and cooperative banks to estimate efficiency scores based on a simple value added function and a multiple input multiple output cost function the results reveal that the efficient benchmark banks have production and cost elasticities which differ considerably from elasticities obtained from conditional mean functions and stochastic frontier functions

injecting charter school best practices into traditional public schools evidence from field experiments this study examines the impact on student achievement of implementing a bundle of best practices from high performing charter schools into low performing traditional public schools in houston texas using a school level randomized field experiment and quasi experimental comparisons the five practices in the bundle are increased instructional time more effective teachers and administrators high dosage tutoring data driven instruction and a culture of high expectations the findings show that injecting best practices from charter schools into traditional houston public schools significantly increases student math achievement in treated elementary and secondary schools by 0 15 to 0 18 standard deviations a year and has little effect on reading achievement similar bundles of practices are found to significantly raise math achievement in analyses for public schools in a field experiment in denver and program in chicago jel codes i21 i24 i28 j24

the impact of ownership on the cost of bus service provision an example from italy this article examines the potential impact of ownership on the cost of bus service provision for a sample of 65 private and 12 public companies providing local public transit lpt in piedmont italy from 1998 to 2002 a translog cost frontier is estimated using the model in battese and coelli 1995 where inefficiency scores are allowed to vary across firms and over time a public ownership dummy is included in the inefficiency model and it is always positive and significant density and scale economies and cost inefficiencies are then computed private companies seem to experience higher density and scale economies than public ones cost inefficiencies appear higher in the public sample

does compulsory school attendance affect schooling and earnings we establish that season of birth is related to educational attainment because of school start age policy and compulsory school attendance laws individuals born in the beginning of the year start school at an older age and can therefore drop out after completing less schooling than individuals born near the end of the year roughly 25 percent of potential dropouts remain in school because of compulsory schooling laws we estimate the impact of compulsory schooling on earnings by using quarter of birth as an instrument for education the instrumental variables estimate of the return to education is close to the ordinary least squares estimate suggesting that there is little bias in conventional estimates every developed country in the world has a compulsory schooling requirement yet little is known about the effect these laws have on educational attainment and earnings 1 this paper exploits an unusual natural experiment to estimate the impact of compulsory schooling laws in the united states the experiment stems from the fact that children born in different months of the year start school at different ages while compulsory schooling laws generally require students to remain in school until their sixteenth or seventeenth birthday in effect the interaction of school entry requirements and compulsory schooling laws compel students born

the potential estimation and factor analysis of china s energy conservation on thermal power industry new huadu business school research fund national social science foundation of china 12zd059 ministry of education 10gbj013

a unified welfare analysis of government policies we conduct a comparative welfare analysis of 133 historical policy changes over the past half century in the united states focusing on policies in social insurance education and job training taxes and cash transfers and in kind transfers for each policy we use existing causal estimates to calculate both the benefit that each policy provides its recipients measured as their willingness to pay and the policy s net cost inclusive of long term impacts on the government s budget we divide the willingness to pay by the net cost to the government to form each policy s marginal value of public funds or its mvpf comparing mvpfs across policies provides a unified method of assessing their impact on social welfare our results suggest that direct investments in low income children s health and education have historically had the highest mvpfs on average exceeding 5 many such policies have paid for themselves as governments recouped the cost of their initial expenditures through additional taxes collected and reduced transfers we find large mvpfs for education and health policies amongst children of all ages rather than observing diminishing marginal returns throughout childhood we find smaller mvpfs for policies targeting adults generally between 0 5 and 2 expenditures on adults have exceeded this mvpf range in particular if they induced large spillovers on children we relate our estimates to existing theories of optimal government policy and we discuss how the mvpf provides lessons for the design of future research

the role of information and social interactions in retirement plan decisions evidence from a randomized experiment this paper analyzes a randomized experiment to shed light on the role of information and social interactions in employees decisions to enroll in a tax deferred account tda retirement plan within a large university the experiment encouraged a random sample of employees in a subset of departments to attend a benee ts information fair organized by the university by promising a monetary reward for attendance the experiment multiplied by more than e ve the attendance rate of these treated individuals relative to controls and tripled that of untreated individuals within departments where some individuals were treated tda enrollment e ve and eleven months after the fair was signie cantly higher in departments where some individuals were treated than in departments where nobody was treated however the effect on tda enrollment is almost as large for individuals in treated departments who did not receive the encouragement as for those who did we provide three interpretations differential treatment effects social network effects and motivational reward effects to account for these results

labor market analysis and labor policymaking in the nation s capital the author who served as chief economist checo at the u s department of labor in 2011 and 2012 discusses her work in the department and the nature of government policy making in the areas of labor and employment she lauds the extent to which policy making in the department is based on empirical evidence and economic analysis and says greater interaction between the department and academic economists who can provide such evidence and analysis would be beneficial she offers figures on the ongoing labor market effects of the 2008 financial crisis and ensuing recession and discusses the department s efforts to address problems including long term unemployment and the problems of african american and hispanic workers

the impact of housing assistance on child outcomes evidence from a randomized housing lottery one long standing motivation for low income housing programs is the possibility that housing affordability and housing conditions generate externalities including on children s behavior and long term life outcomes we take advantage of a randomized housing voucher lottery in chicago in 1997 to examine the longterm impact of housing assistance on a wide variety of child outcomes including schooling health and criminal involvement in contrast to most prior work focusing on families in public housing we focus on families living in unsubsidized private housing at baseline for whom voucher receipt generates large changes in both housing and nonhousing consumption we find that the receipt of housing assistance has little if any impact on neighborhood or school quality or on a wide

reducing crime and violence experimental evidence from cognitive behavioral therapy in liberia abstract we show that a number of noncognitive skills and preferences including patience and identity are malleable in adults and that investments in them reduce crime and violence we recruited criminally engaged men and randomized one half to eight weeks of cognitive behavioral therapy designed to foster self regulation patience and a noncriminal identity and lifestyle we also randomized 200 grants cash alone and therapy alone initially reduced crime and violence but effects dissipated over time when cash followed therapy crime and violence decreased dramatically for at least a year we hypothesize that cash reinforced therapy s impacts by prolonging learning by doing lifestyle changes and self investment jel d12 d83 h23 i32 k42 o15 o17

political power economic freedom and congress effects on bank performance abstract this paper studies the linkages between bank performance connections to powerful politicians and the degree of economic freedom in a bank s home state we find that bank performance is positively related to state economic freedom we also reconfirm the finding of gropper et al 2013 that bank performance is improved by political connections however the positive effect of political connections appears to be significantly reduced when there is a higher degree of economic freedom in the state indicating that political connections may matter less to banks when there is more economic freedom economic freedom in a state can have a beneficial effect on state economic growth and hence may outweigh any political connection benefits however the declines in state economic freedom in recent years could make political connections potentially more valuable to banks

explaining differences in milk quota values the role of economic efficiency this paper explores the relationship between milk quota values and economic efficiency in order to analyze current government interventions in quota allocations among producers for this purpose we estimate a short run variable cost function using a panel of spanish dairy farms quota values are then decomposed into economic efficiency price and scale effects in order to assess the relative influence of these factors on quota values we find that efficiency is important in explaining quota values but is uncorrelated with observable farm characteristics this casts doubts on the government s ability to allocate quotas to efficient farms in the way a well functioning quota market does

frontier estimation and firm specific inefficiency measures in the presence of heteroscedasticity the purpose of this article is to illustrate a straightforward and useful method for addressing the problem of heteroscedasticity in the estimation of frontiers a heteroscedastic cost frontier model is developed and estimated using bank cost data similar to that used by ferrier and lovell our results show dramatic changes in the estimated cost frontier and in the inefficiency measures when accounting for heteroscedasticity in the estimation process we find that the rankings of firms by their inefficiency measures is affected markedly by the correction for heteroscedasticity but not by alternative distributional assumptions about the one sided error term

better late than nothing some comments on deaton 2009 and heckman and urzua 2009 two recent papers deaton 2009 and heckman and urzua 2009 argue against what they see as an excessive and inappropriate use of experimental and quasi experimental methods in empirical work in economics in the last decade they specifically question the increased use of instrumental variables and natural experiments in labor economics and of randomized experiments in development economics in these comments i will make the case that this move towards shoring up the internal validity of estimates and towards clarifying the description of the population these estimates are relevant for has been important and beneficial in increasing the credibility of empirical work in economics i also address some other concerns raised by the deaton and heckman urzua papers

biases in frontier estimation due to heteroscedasticity abstract this paper investigates the effects of heteroscedasticity on the parameters in frontier regression models a monte carlo experiment is employed to determine that heteroscedasticity leads to overestimation of the intercept and underestimation of the slope coefficients

a note on long term contracts abstract the purpose of this paper is three fold i to interpret townsend s 1982 long term contract model as a labor contract model where a value of job matching for a worker is a private information ii to contrast townsend s long term contract model with holmstrom s 1983 long term contract model in a common framework and iii to explore the effect of workers mobility on the contract configuration of the two models both holmstrom and townsend construct models in which a single period contract is not viable but a long term contract is however reasons for this characteristic in the two models are quite different this paper proposes a simple framework of labor contracts with illustrates the essential difference of the two models and the role of mobility costs mobility costs in the two types of long term contracts are shown to be beneficial for both workers and the firm results of comparative statics show how contract configurations in two models are influenced by changes in mobility costs

the impact of farmers health and nutritional status on their productivity and efficiency evidence from ethiopia this article focuses on the link between agricultural productivity and health and nutrition status of peasants in ethiopia the data come from the first round of the ethiopian rural household survey conducted in 1994 the sites selected were those in which farmers practice ox plow cultivation of cereals a stochastic frontier approach was adopted for the agricultural production the findings of the study show that the distance to the source of water as well as nutrition and morbidity status affect agricultural productivity the market wage rate is also very responsive to the weight for height as well as the body mass index and height in a context where separability between consumption and production decisions of the household is rejected elasticities of labor productivity with respect to nutritional status are noted to be strong and similar in technology estimates and wage equations moreover returns to investment in nutrition are clearly high in the ethiopian context overall the results indicate substantial loss in output due to technical inefficiency even after accounting for the health and nutrition of workers

corporate lobbying political connections and the bailout of banks abstract political involvement has long been shown to be a profitable investment for firms that seek favorable regulatory conditions or support in times of economic distress but how important are different types of political involvement for the timing and magnitude of political support to answer this question we take a comprehensive look at the lobbying expenditures and political connections of banks that were recipients of government support under the 2008 troubled asset relief program tarp we find that politically engaged firms were not only more likely to receive tarp funds but they also received a greater amount of tarp support and received the support earlier than firms that were not politically involved

are women better bankers to the poor evidence from rural microfinance institutions microfinance institutions mfis provide financial services to the poor and in many ways resemble both banks and non profit organizations many mfis target women because more women than men are poor especially in rural areas studies show that women manage money differently from men and have different leadership styles thus in credit unions and financial firms female and male managers achieve different results in microfinance gender diversity on the board of mfis is beneficial and loans authorized by female loan officers have lower default rates motivated by these findings we ask whether mfis with a female chief executive officer ceo are more efficient at serving the poor without jeopardizing financial sustainability we adapt the banking approach to managerial in efficiency to account for the outreach and sustainability goals of the mfis and evaluate whether mfis outreach efficiency differs by the gender of their respective ceos we estimate a stochastic frontier cost function using the battese coelli 1995 model and the true random effects estimators using panel data from over 250 mfis we find that mfis with female ceos have significantly higher outreach efficiency than mfis with male ceos similar results are found with a two step stochastic frontier approach overall the results suggest that promoting gender diversity at the top levels of mfi management is likely to have both social and financial benefits

the impact of vocational training for the unemployed experimental evidence from turkey this brief summarizes the updates from the 2014 paper entitled the impact of vocational training for the unemployed experimental evidence from turkey conducted between between 2010 and 2011 in turkey a randomized experiment is used to evaluate a large scale active labor market policy turkey s vocational training programs for the unemployed a detailed follow up survey of a large sample with low attrition enables precise estimation of treatment impacts and their heterogeneity the average impact of training on employment is positive but close to zero and statistically insignificant which is much lower than either program officials or applicants expected over the first year after training the paper finds that training had statistically significant effects on the quality of employment and that the positive impacts are stronger when training is offered by private providers however longer term administrative data show that after three years these effects have also dissipated

nonparametric bounds on treatment effects assume that each member of a population is characterized by values for the variables ya yb z x here x is a vector describing a person and z is a binary variable indicating which of two treatments this person receives the treatments are labelled a and b the variables ya and yb are scalar measures of the outcomes of the two treatments for example a cancer patient might be treated by a drug therapy or b surgery the relevant outcome y might be life span following treatment an unemployed worker might be given a vocational training or b job search assistance here the relevant outcome might be labor force status following treatment assume that a random sample is drawn and that one observes the realizations of z x and of the outcome under the treatment received thus ya is observed if treatment a is received but is a latent variable if treatment b is received similarly yb is either observed or latent suppose that one wants to learn the difference in expected outcome if all persons with attributes x were assigned to treatment a or b this treatment effect is

the effects of class size on student achievement new evidence from population variation abstract i identify the effects of class size on student achievement using longitudinal variation in the population associated with each grade in 649 elementary schools i use variation in class size driven by idiosyncratic variation in the population i also use discrete jumps in class size that occur when a small change in enrollment triggers a maximum or minimum class size rule the estimates indicate that class size does not have a statistically significant effect on student achievement i rule out even modest effects 2 to 4 percent of a standard deviation in scores for a 10 percent reduction in class size

exploring differences in employment between household and establishment data using a large data set that links individual current population survey cps records to employer reported administrative data we document substantial discrepancies in basic measures of employment status that persist even after controlling for known definitional differences between the two data sources we hypothesize that reporting discrepancies should be most prevalent for marginal workers and for marginal or nonstandard jobs and we find systematic associations between the incidence of reporting discrepancies and observable person and job characteristics that are consistent with this hypothesis the paper discusses the implications of the reported findings for both micro and macro labor market analysis

elasticity of substitution and technical efficiency evidence from the us electricity generation abstractthe implications of national or regional energy policies for technical efficiency and environmental outcomes in electricity generation depend on fossil fuel input substitution this study u