oil prices breaks and trends abstract this paper contributes to the literature of the stationarity of financial time series and the literature on oil and macroeconomics in several ways first it uses kejriwal and perron 2010 sequential procedure to endogenously determine multiple structural changes in real oil prices without facing the circular testing problem between structural changes and stationary assumptions of previous tests second it performs a diagnostic check to detect the significance and magnitude of the potential breaks third it uses the above information to test for the existence of stochastic trends in real oil prices and fourth it speculates about possible explanations for the break dates found in order to encourage further work and discussions the exercise uses monthly data from january 1861 to august 2011

quick job entry or long term human capital development the dynamic effects of alternative training schemes this study evaluates and compares the eectiveness of two alternative training schemes for the unemployed short job search oriented training and long human capital oriented training we investigate the impact dynamics of these pro grams considering both unemployment and employment duration our analysis uses a rich administrative longitudinal data set for germany where both programs were implemented at the same time our estimation strategy flexibly accounts for dy namic selection on observables and unobservables as well as heterogeneous treatment eects the results indicate that short term training schemes can be an eective tool to reduce unemployment in the long run in particular if participation occurs early during unemployment long term training schemes increase the average du ration of employment spells more strongly than short term training however they increase the expected unemployment duration if they are started early during un employment this negative short run impact of long term training is an important driver of its overall eectiveness

evaluating welfare reform in the united states this paper reviews the economic literature on welfare reform over the 1990s a brief summary of the policy changes is followed by a discussion of the methodological techniques that analyze the effects of these changes on outcomes the paper then critically reviews the econometric and experimental literature on caseload changes labor force changes poverty and income changes and family formation changes a growing body of evidence suggests that recent policy changes have influenced economic behavior and well being one particular set of new style welfare programs seems to show especially promising results with significantly increased work and earnings and reduced poverty

natural resource prices will they ever turn up abstract natural resource theory predicts that natural resource rents should increase over time however technical progress in resource extraction environmental constraints or great natural abundance could result in stagnant or declining product prices thus there is no theoretical reason to believe that product prices will rise in the near future the prediction of product prices by time series methods is shown to depend critically upon whether the series are modeled as difference or trend stationary dickey fuller and lagrange multiplier tests are used to show that the series are difference stationary long and short sample series are tested trend stationary modeling strongly predicts rising resource prices the result from difference stationary modeling is that there is only a weak supposition that natural resource prices will rise

long run effects of public sector sponsored training in west germany between 1991 and 1997 west germany spent on average about 3 6 bn euro per year on public sector sponsored training programmes for the unemployed we base our empirical analysis on a new administrative data base that plausibly allows for selectivity correction by microeconometric matching methods we identify the effects of different types of training programmes over a horizon of more than seven years using bias corrected weighted multiple neighbours matching we find that all programmes have negative effects in the short run and positive effects over a horizon of about four years however for substantive training programmes with duration of about two years gains in employment probabilities of more than 10 points appear to be sustainable but come at the price of large negative lock in effects

conditional convergence in australia s energy consumption at the sector level abstract we examine the convergence of energy consumption per capita at the sector level in australia over the period 1973 74 to 2013 14 to do so we employ recently developed lm and rals lm unit root tests that accommodate up to two endogenously determined structural breaks we find support for energy consumption per capita convergence for six of seven sectors in australia

testing for common features in north american energy markets abstract using recent advances in the field of applied econometrics we explore the strength of shared trends and shared cycles between north american natural gas and crude oil markets in doing so we use daily data from january 1991 to april 2001 on spot u s henry hub natural gas and wti crude oil prices the results show that there has been decoupling of the prices of these two sources of energy as a result of oil and gas deregulation in the united states we also investigate the interconnectedness of north american natural gas markets and find that north american natural gas prices are largely defined by the u s henry hub price trends

assessing the dynamic efficiency gains of tax reform when human capital is endogenous this paper develops a life cycle growth model with endogenous human capital accumulation and variable leisure which is employed to simulate dynamic equal yield changes from an income tax to a consumption tax although endogenizing human capital investment decisions raises partial equilibrium estimates of the efficiency costs of capital income taxation general equilibrium welfare impacts of unanticipated tax changes are little affected by the inclusion of endogenous human capital this finding cannot be fully explained by the presence of general equilibrium adjustments in factor prices and can be attributed in part to the existence of transitional rigidities in capital stocks copyright 1995 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

the pre programme earnings dip and the determinants of participation in a social programme implications for simple programme evaluation strategies the key to estimating the impact of a programme is constructing the counterfactual outcome representing what would have happened in its absence this problem becomes more complicated when agents such as individuals firms or local governments self select into the programme rather than being exogenously assigned to it this paper uses data from a major social experiment to identify what would have happened to the earnings of self selected participants in a job training programme had they not participated in it we investigate the implications of these earnings patterns for the validity of widely used before after and difference in differences estimators

identification results for duration models with multiple spells the purpose of this paper is to investigate the identifiability of duration models with multiple spells we prove that the results of elbers and ridder 1982 and heckman and singer 1984 can be generalized to multi spell models with lagged duration dependence we also prove that without lagged duration dependence the identification result does not depend on moment conditions or tail conditions on the mixing distribution this result is in contrast to ridder s 1990 result for single spell models

insurance and labor market contracting an analysis of the capital market assumption in recent years a large literature has developed that investigates the role of insurance in labor market contracting papers in this literature typically assume that workers are completely restricted from borrowing we argue and to some extent demonstrate that in many environments capital market imperfections do not lead to a noborrowing result but rather to a capital market assumption that is intermediate between the no borrowing assumption and the perfect capital market assumption we then consider some of the ramifications that this intermediate capital market assumption has on the type of insurance the firms provide through the labor market contract

determinants of the crude oil futures curve inventory consumption and volatility abstract since 2008 the wti oil futures curve has been positively sloped for extended periods we test whether changes in inventory alone can explain this atypically long contango to do this we estimate monthly vars of the cme wti oil futures spread and oecd and u s inventory in line with standard theory and add petroleum consumption and implied volatility to the vector of endogenous variables when we model the futures spread as one continuous series results confirm two way causation between inventory and the futures curve as predicted by the theory of storage however when we separate negative and positive futures spreads we find that two way causation between the futures spread and u s inventory breaks down shocks to oecd petroleum consumption cause more negative spreads and shocks to u s consumption cause more positive spreads in addition to inventory driven changes and increases in volatility directly raise positive spreads these new causal channels have become significant since 2008 and can be related to higher inventory inelastic supply of oil and uncertainty about global economic conditions

trends in natural resource commodity prices deterministic or stochastic abstract the type of trend be it stochastic or deterministic exhibited by the price of a resource commodity should play a critical role in the development and empirical verification of theories which may explain its long run behavior the nature of the trend however can only be discerned through empirical testing to this end we present a menu of unit root testing procedures for characterizing observed trends in any economic time series including natural resource commodity prices we examine the prices of 11 resource commodities the evidence suggests that five price series exhibit stochastic trends while the remaining six price series appear to be stationary around a deterministic trend

pensions in labor contracts this paper con siders the optimality of a two period employment contract between a firm and a worker in which the firm provides the employee with insurance against states of low consumption with a wage pension payment schedule contingent upon the worker s productivity and state of employment the paper shows that with endogenous quits and dismissals the equilibrium pension plan could either impose vesting requirements or provide for severance pay depending on the relative perceptions of the probability of separation by the two parties the worker s productivi ty in each state of employment and the firm s policy regarding emplo yee retention copyright 1988 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

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

optimal labour contracts under asymmetric information an introduction the review of economic studies has instituted a new series of lectures to be given annually by a younger british economist at the association of university teachers of economics meetings the choice of lecturer is determined by a panel whose members are currently professors hahn mirrlees and nobay this paper is a revised version of the first lecture in the series it was presented at the aute meeting held at the university of surrey in april 1982 and was refereed in the usual way mak

making the most out of programme evaluations and social experiments accounting for heterogeneity in programme impacts the conventional approach to social programme evaluation focuses on estimating mean impacts of programmes yet many interesting questions regarding the political economy of programmes the distribution of programme benefits and the option values conferred on programme participants require knowledge of the distribution of impacts or features of it this paper presents evidence that heterogeneity in response to programmes is empirically important and that classical probability inequalities are not very informative in producing estimates or bounds on the distribution of programme impacts we explore two methods for supplementing the information in these inequalities based on assumptions about participant decision making processes and about the strength in dependence between outcomes in the participation and non participation states dependence is produced as a consequence of rational choice by participants we test for stochastic rationality among programme participants and present and implement methods for estimating the option values of social programmes

consumer electricity and gas prices across australian capital cities structural breaks effects of policy reforms and interstate differences abstract we detect and analyze the most significant structural changes in the quarterly growth rate of consumer electricity and gas prices in australia and estimate their corresponding seasonal effects to do so we apply the general modelling framework of the bai perron breaking regression to all available quarterly data for capital cities individually and australia as a whole 1989q3 2017q2 retail energy prices in most australian states were deregulated in the 2000s we find that increases in average quarterly growth rates of electricity and gas prices consistently occurred in the third september quarter and find very few instances of increases in any other quarters of the year in the post deregulation period price increases are significantly higher than in the pre deregulation era results for some capital cities are stark in perth third quarter growth in electricity prices has been five times higher after the structural break in australia as a whole third quarter growth in gas prices has been three times higher after the structural break we discuss several possible explanations for energy price rises in the period since deregulation

jump dynamics with structural breaks for crude oil prices this study investigates the joint phenomena of permanent and transitory components in conditional variance and jump intensity along with verification of structural breaks for crude oil prices we adopt a component arji model with structural break analysis utilizing daily data on west texas intermediate crude oil spot and futures contracts the analytical results verify the existence of permanent and transitory components in conditional variance with the permanent component of conditional variance increasing with the occurrence of a sudden major event such as the iraqi invasion of kuwait operation desert storm and the war between the us and iraq and a relatively greater increase in the transitory component over the same period notably jump intensity fluctuates with an increase in the transitory component of conditional variance in response to abnormal events it is the transitory component which serves as the primary influential factor for jumps in returns therefore speculators are willing to take large risks particularly with respect to anticipating future price movements or gambling in the hopes of rapidly making substantial gains thus speculators prefer the temporary volatility component and engage in trade activities however investors prefer the permanent volatility component because they may well be better off relocating their assets into more stable portfolios to outperform the market portfolio over the long run

an evaluation of the swedish system of active labour market programmes in the 1990s we investigate the presence of short and long term effects from joining a swedish labor market program vis a vis more intense job search in open unemployment overall the impact of the program system is found to have been mixed joining a program has increased employment rates among participants a result robust to a misclassification problem in the data on the other hand it has also allowed participants to remain significantly longer on unemployment benefits and more generally in the unemployment system this being particularly the case for those entitled individuals entering a program around the time of their unemployment benefits exhaustion

breaks trends and unit roots in spot prices for crude oil and petroleum products abstract this study examines the trend properties in energy price series using weekly spot price data for crude oil heating oil and regular gasoline in particular the procedures proposed by perron and yabu 2009b are employed to test for a one time break in the trend function of each price series with no prior knowledge of whether the noise component is stationary or has an autoregressive unit root based on the results of the break estimate the unit root test developed by kim and perron 2009 is performed to examine the stationarity of the prices finally we extend the one break analysis to the case with multiple breaks by employing the break test proposed by kejriwal and perron 2010 and the unit root test of carrion i silvestre et al 2009 the results consistently demonstrate evidence of structural breaks and reject the unit root null hypothesis for all the price series suggesting that energy prices are persistently influenced by long term economic fundamentals instead of temporal policy changes

salaries and piece rates compensation can take many forms remuneration can come as pecuniary payments as fringes such as health and pension benefits or as a nonpecuniary reward such as plush office furniture that costs the firm less than it benefits the worker a significant literature has examined the trade offs between pecuniary and nonpecuniary compensation the modern work having been pioneered by rosen 1974 more recently another body of literature has examined the selection of method of total compensation ignoring the distinction between pecuniary and nonpecuniary payment this work has focused on risk and incentive factors it has resulted in comparisons of compensation based on absolute output levels to that based on relative performance it has also led to explorations of the relation of compensation to experience over the work life 2 little attention has been paid to what may be among the most important and obvious distinction in methods of compensation namely the choice between a fixed salary for some period of time that is paying on the basis of input and some workers receive compensation that is specified in advance and not directly contingent on performance instead it depends on an input measure such as hours worked for others compensation is directly related to output this essay is an attempt to predict a firm s choice of compensation method piece rates are defined more rigorously among the more important factors discussed are worker heterogeneity incentives sorting considerations monitoring costs and asymmetric information one result is that salary workers tend to be of lower quality and more homogeneous than are their piece rate counterparts numerous additional results are provided helpful comments by victoria lazear and yoram weiss are gratefully acknowledged support was provided by the department of labor and the national science foundation 1 see lazear and rosen 1981 stiglitz 1981 holmstrom 1982 green and stokey 1983 2 see lazear 1979 1981 and harris and holmstrom in press

the impact of being offered and receiving classroom training on the employment histories of disadvantaged women evidence from experimental data we address two questions using experimental data on disadvantaged women first what is the impact of being offered jtpa classroom training on the duration of unemployment and employment second what is the effect of actually participating in this training on the length of such spells belonging to the treatment group shortens unemployment spells but has no effect on employment spells actually participating in training has a larger positive effect on the exit rate from unemployment than the effect of simply being a member of the treatment group ignoring the endogeneity of actual training in estimation substantially underestimates its effect

micro foundations for wage flexibility wage insurance at the firm level to what extent do firms insulate their workers wages from fluctuations in product markets which firm and worker attributes are associated with wage flexibility at the micro level we first rely on guiso pistaferri and schivardi 2005 to estimate dynamic models of sales and wages finding that in portugal workers wages respond to permanent shocks on firm performance as opposed to transitory shocks we then explore the factors associated with wage flexibility finding that collective bargaining and minimum wages are associated with higher wage insurance by the firm while the threat of firm bankruptcy reduces it managers receive less protection against permanent shocks than other workers

work incentives hierarchy and internal labor markets this paper argues that contracts with payment based on a ranking of employee performance can provide performance incentives even under asymmetric information that prevents payment based on individual performance only being enforceable such contracts also fit with five features of labor markets that have aroused considerable interest 1 hierarchical wage structures 2 internal promotion 3 wage rates that rise with seniority and experience more than productivity 4 the variance of earnings increasing with experience and 5 wage rates attached to jobs rather than individuals with differentials set by administrative procedures rather than by reference to external market wages

the employment dynamics of disadvantaged women evidence from the sipp understanding the employment dynamics of disadvantaged families is increasingly important we estimate duration models describing these dynamics for disadvantaged single mothers and use them to conduct a rich set of counterfactual analyses we use a misreporting model to correct for seam bias the problem that too many transitions are reported between reference periods in panel data we find effects of demographics minimum wages unemployment rates and maximum welfare benefits but not policy changes introduced through state welfare waivers on employment dynamics we find that two commonly used ad hoc methods of addressing seam bias perform substantially worse than our approach

evaluating the impact of french employment policies on individual labour market histories this paper deals with the evaluation of some public employment policies set up in france during the 1980 s to improve the labour market prospects of unskilled young workers the evaluation implemented in this paper is restricted to the impact of such public measures on durations and outcomes of subsequent spells of unemployment and employment the econometric study is conducted with non experimental longitudinal microdata recording individual labour nlarket histories a particular attention is paid to the differential effects of various types of measures according to the educational level of recipients programmes involving a higher level of on thejob training such as alternating work training programmes in private firms are principally beneficial to the less educated young workers in contrast for more educated young workers work fare programmes in the public sector decrease the intensity of transition from the subsequent unemployment spell to regular jobs for that subgroup work fare programmes may act as a signal of low employment performance

trends in world energy prices the correct identification of the time series path of non renewable energy resources has far reaching consequences for economists and policymakers alike this study builds on the existing literature by employing a data series that includes a sample period of institutional change and recently developed unit root testing procedures besides crude oil natural gas and coal prices are also examined aiming to further the knowledge of non renewable energy resource time paths in order to inform future research and update the conclusions of past studies the unit root tests allow for structural breaks and are based on the procedures developed by zivot and andrews 1992 lumsdaine and papell 1997 and lee and strazicich 2003 finally we investigate whether the trend changes signs in the regimes which are bounded by the structural breaks and quantify the prevalence of the trends over the sample period considered the results show that the trend is not well represented by a single positive or negative trend the variability of the trend suggests that forecasting energy prices should not typically occur about a single trend

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

organizing contests for status the matthew effect vs the mark effect what is the best way to design tournaments for status in which individuals labor primarily for the esteem of their peers what process in other words should organizers of status based contests impose upon those who covet peer recognition we propose a formal model of status based competition that contrasts two competing alternatives the first following merton is the matthew effect according to which a tournament s architect directs slack resources to elite actors and thus widens the distribution of rewards by favoring cumulative advantage the second is the mark effect under which a tournament s designer instead pushes slack resources to marginal actors and thus tightens the distribution of rewards our results suggest that although the mark effect is better for the social welfare of most tournaments the matthew effect is preferable in two distinct contexts in small tournaments where variation in underlying ability translates into acute advantages for the most capable contestants and in large tournaments whose contestants face constant rather than rising marginal costs a condition we relate to contestants perception of their work as intrinsically valuable our contributions are twofold we find counter to the thrust of merton s work that cumulative advantage is not invariably optimal for the functioning of status contests and we identify circumstances in which the production of superstars is likely to make contests for status better off in aggregate implications for future research on status and management are discussed this paper was accepted by olav sorenson organizations and social networks

wages effort and incentive compatibility in life cycle employment contracts existing models of incentive compatibility in life cycle employment contracts arrive at different predictions partly because of the different kinds of contract breaking behavior allowed in them this paper sets out and classifies the full range of such behaviors argues that no model has yet incorporated all of them and examines the consequences of doing so in the context of lazear s well known model in the extended model wages cannot rise faster than marginal products throughout the entire contract and the set of feasible contracts can often be empty even when both parties can commit to terminate the contract whenever it is broken by the other party

the impact of labour market dynamics on the return migration of immigrants using administrative panel data on the entire population of new labour immigrants to the netherlands we estimate the effects of individual labour market spells on immigration durations using the timing of events method the model allows for correlated unobserved heterogeneity across migration unemployment and employment processes we find that unemployment spells increase return probabilities for all immigrant groups while re employment spells typically delay returns

active labor market policy evaluations a meta analysis this article presents a meta analysis of recent microeconometric evaluations of active labour market policies we categorise 199 programme impacts from 97 studies conducted between 1995 and 2007 job search assistance programmes yield relatively favourable programme impacts whereas public sector employment programmes are less effective training programmes are associated with positive medium term impacts although in the short term they often appear ineffective we also find that the outcome variable used to measure programme impact matters but neither the publication status of a study nor the use of a randomised design is related to the sign or significance of the programme estimate

whither the terms of trade an elaboration of the prebisch singer hypothesis movements in the prices of primary products and manufactured goods are analysed using a model that introduces differences in wage and price determination between primary production and manufacturing wages and prices in primary production are treated as competitively determined while prices and wages in manufacturing are determined by mark up pricing and union employer bargaining respectively the objective is to capture the influence of structural differences between manufacturing and primary production on the terms of trade between industrialised and developing worlds as discussed in the seminal contributions to the development literature by raul prebisch and hans singer the model is estimated using price and wage data from the post world war ii period support is found for the prebisch singer hypothesis however our estimates suggest that during periods of particularly rapid manufac turing growth there have been intervals of net improvement in the terms of trade of primary producers

wage contracts when output grows stochastically the roles of mobility costs and capital market imperfections the paper considers an industry in which individual output follows a stochastic growth process with a cumulative effect it analyzes the roles of labor mobility and capital market conditions in the determination of wage contracts positive costs of mobility are shown to be necessary for the provision of wage and employment insurance when workers have no access to the capital market when insurance is provided wages grow less than average productivity if the capital market is perfect wage insurance will be provided even in the absence of costs of mobility in this case wages grow faster than average productivity

the impact of active labour market programmes on the duration of unemployment in switzerland this article evaluates the effects of swiss active labour market programmes on the job chances of unemployed workers the main innovation is a comparison of two important dynamic evaluation estimators the matching estimator and the timing of events estimator we find that both estimators generate different treatment effects according to the matching estimator temporary subsidised jobs shorten unemployment duration whereas training programmes and employment programmes do not in contrast the timing of events estimator suggests that none of the swiss active labour market programmes shortens unemployment duration the aim of the present article is to study the impact of active labour market policies almps on the duration of unemployment in switzerland the new swiss almps reflect the increasing consensus among policy makers that actively assisting the unemployed in job search is preferable to simply providing them with passive income support the danger is so the argument goes that reliance on passive income support may reduce work incentives and job search activities and therefore increase the risk of long term unemployment almps are seen by many as the key to minimise these risks the question how participation in almp measures affects labour market histories of individuals has been the subject of substantial debate the main problem is that labour market outcomes for participants may be systematically different from non participants

labour market effects of retraining for the unemployed the role of occupations abstractwe analyse the impact of retraining for unemployed low skilled job seekers in germany this extensive training programme leads to a formal vocational degree which is often required to access certain professions applying statistical matching methods we find that on average after a period with large lock in effects retraining strongly increases the employment probability of participants especially women we add to the literature by estimating the employment effects for different occupations for which participants are trained our results show that there are substantial differences depending on the occupation as the composition of trained occupations differs for men and women segregation could be a driver of higher employment effects for women however comparisons of men and women trained for the same occupations reveal that even after controlling for segregation women profit more from retraining while caseworkers are instructed to choose professions with high labour demand other aspects

a novel market efficiency index for energy futures and their term structure risk premiums abstract this paper proposes a novel futures market efficiency index which aggregates the efficiencies of futures contracts across their term structure spanning from one month to 12 months the index measures the ability for price discovery of a long term futures contract on its nearby short term contract consistently across its terms the index uses a recently developed futures market efficiency test which accounts for heteroscedastic prices and time varying risk premiums it simultaneously estimates the term premiums of futures providing valuable information for the investor the proposed index is employed to investigate the efficiencies of four major energy commodities namely crude oil natural gas heating oil and gasoil during the sample period 1990 2016 numerical results indicate that the market efficiencies vary across terms and across energy commodities gasoil futures traded on the intercontinental exchange ice are the most efficient and natural gas futures are the least efficient in prices the spillover dynamics of market risk information across futures markets are investigated using conditionally heteroscedastic common factors chcfs extracted for each commodity using the estimated term premiums there exist significant delayed contemporaneous and potential information spillovers among term premiums of the energy commodities in our sample our findings are robust and they can help investors to optimally diversify their portfolios

the agent agents problem payment by relative output this paper begins an investigation into the incentive problems at a firm when the effort of the employer and the employees combines to determine final output the major conclusion is that optimal reward functions in this circumstance will in general value the performance of a worker relative to that of his peers the paper thus joins a growing literature associated with the work of lazear and rosen on rank order tournaments

active labor market policy effects in a dynamic setting this paper develops and implements a method to identify and estimate treatment effects in a dynamic setting where treatments may occur at any point in time by combining the standard matching approach to the timing of events approach it demonstrates that the effect of the treatment on the treated at a given date can be identified although non treated may be treated later in time the approach builds on a no anticipation assumption and the assumption of conditional independence between the duration before treatment and the duration before exit to illustrate the approach the paper studies the effect of training for unemployed workers in france using a rich register data set training has little impact on unemployment duration the contamination of the standard matching estimator due to later entries into treatment is large if the treatment probability is high

constraints on the choice of work hours agency versus specific capital lifetime contracts imply that at a given time wages and value of marginal product vmp will diverge the contract will specify hours as well as wages since firms will desire to prevent workers from working more when the wage is greater than vmp and from working less when the wage is less than vmp if hours are set efficiently workers will face binding hours constraints the agency model and the firm specific capital models make opposite predictions regarding the relation between work hours constraints and job tenure we test these predictions our results indicate that neither model explains the observed pattern of hours constraints

differences in wage distributions between canada and the united states an application of a flexible estimator of distribution functions in the presence of covariates we construct a tractable flexible functional form estimator of cumulative distribution functions for non negative random variables which admits large numbers of covariates the estimator adopts and extends techniques from the spell duration literature for estimating hazard functions to distribution functions for wages earnings and income we apply these methods to investigate sources of wage inequality for full time male workers between canada and the united states finding that the canadian wage density has a thinner left tail because low educated workers have higher pay and a thinner right tail because of a lower proportion of highly educated workers unions appear to play a large role in these outcomes

the effects of welfare to work program activities on labor market outcomes studies examining welfare to work program effectiveness present mixed and sometimes discrepant findings partly due to research design data and methodological limitations using administrative data on missouri and north carolina welfare recipients we substantially improve on past estimation approaches to identify the distinct effects of each state s welfare to work subprograms assessment job search assistance and job readiness training and more intensive programs designed to augment human capital more intensive training is associated with greater initial earnings losses but also greater long run earnings gains the negative program impacts we observe in quarters immediately following participation turn positive by the second year after participation