comparing public and private schools the puzzling role of selectivity bias recent articles using the same data and variants of the same estimation technique report conflicting estimates of the relative quality of education provided by public and catholic schools this article explains the reasons for the conflict in so doing the article clarifies the assumptions underlying the increasingly popular two step methods for controlling selectivity bias and highlights the hazards of using these methods when the assumptions are not satisfied the article also illustrates an alternative method for detecting the presence of selectivity bias

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

tax management and investment strategies of property liability insurers abstract the tax reform act tra of 1986 reduced the incentives for institutional investors to participate in the tax exempt bond market this paper develops a model of profit maximization incorporating the tra provisions applicable to property liability pl insurers the theory predicts that pl insurers will use underwriting losses to shelter taxable investment income and invest the balance of their portfolios in tax favored securities our empirical evidence reveals that insurers continued to invest in tax exempts following the tra suggesting that implicit tax rates are low enough to attract insurers into the long term tax exempt market however insurers reduced the proportions of income derived from tax exempt interest and dividends following the tra

search frictions and labor market participation abstract cross country differences in labor market participation are often larger than differences in unemployment rates the same holds true across demographic groups within a given economy we argue that the interaction between labor force participation decisions and labor market frictions can help us understand these patterns this interaction highlights dynamic aspects of the participation decision in contrast to standard textbook treatments that emphasize static costs and benefits of participation we extend the standard labor market search problem to allow for a third state non participation and assumes that stochastic participation costs precipitate flows into and out of non participation we fully characterize the worker s decision problem and use numerical simulations to demonstrate how participation patterns vary with individual characteristics and with labor market conditions

delta hedging strategies comparison abstract in this paper we implement dynamic delta hedging strategies based on several option pricing models we analyze different subordinated option pricing models and we examine delta hedging costs using ex post daily prices of s p 500 furthermore we compare the performance of each subordinated model with the black scholes model

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

leaving teaching in the uk a duration analysis in this paper the authors analyze the decision by teachers to leave the profession their results affirm the importance of relative earnings in the tenure and turnover decisions of teachers the econometric modeling approach used yields important insights into the appropriateness of adopting a flexible semiparametric specification of the duration dependence structure and of the unobserved heterogeneity distribution in duration models copyright 1995 by royal economic society

ownership versus competition efficiency in public enterprise certainly the introduction of product market competition into potentially competitive or at least contestable markets can improve performance to take just one example morrison and whinston 1986 1986 estimate that even in the imperfectly contestable u s airline industry the annual u s welfare gains from deregulation have been around 6 billion

does unemployment insurance crowd out spousal labor supply previous research on unemployment insurance ui has emphasized the program s effect on individual search behavior this state contingent income may also reduce the labor supply of family members during the unemployment spell we investigate this question within the context of wives labor supply responses to their husbands unemployment spells we find strong crowdout of this form of family self insurance our estimates imply that for each dollar of ui receipt wives earn up to 73 cents less the reduction in spousal hours of work is over 40 as large as previous estimates of the effect of ui on search time of husbands

multinational capital structure and financial flexibility abstract we address multinational capital structure decisions when firms have varying degrees of financial flexibility for shifting income and or tax shields between subsidiaries we find 1 firms can use leverage to dramatically reduce negative valuation effects from operating in a high tax country 2 financial flexibility is a key determinant of optimal capital structure acting as both a substitute and a complement for leverage 3 multinational firms derive a synergistic effect from financial flexibility which can enhance their value beyond that for a single country firm from a low tax jurisdiction and 4 optimal capital structure typically differs substantially across subsidiaries with each having positions in multiple currencies

tax arbitrage restrictions and financial leverage clienteles abstract this paper argues that while total short sale constraints are often introduced to rule out tax arbitrage such constraints are both unrealistic and conceptually problematic instead milder constraints are advocated which prevent tax arbitrage while still allow short positions it is demonstrated that a model with these constraints employed can support bond pricing as in the miller equilibrium although it leads to a richer set of tax clienteles

education and the market which parts of the neoliberal solution are correct abstract for many years the orthodox view among economists has been that the state should take the major responsibility for both financing and supplying educational services over the past decade however a new group of neoliberal critics have argued that education systems in developing countries should be financed more directly by private households particularly under the sharply constrained financial circumstances facing many governments in the south this paper critically reviews the literature pertinent to this debate on the basis of the available evidence it finds that cost recovery policies would be harmful to both efficiency and equity if significant resources were to be generated by these means alternative revenue raising measures are likely to provide a better solution private schooling can be helpful to governments facing strong financial constraints but only under circumstances which are more tightly defined than those generally allowed by most neoliberal authors other policies are available to improve equity and efficiency in education which are not substantially included in the neoliberal case

consumption and portfolio policies with incomplete markets and short sale constraints the infinite dimensional case abstract we employ a martingale approach to study a dynamic consumption portfolio problem in continuous time with incomplete markets and short sale constraints we introduce a notion of minimax local martingale and transform the dynamic problem into a static problem of maximizing expected utility over the consumption bundles that satisfy a single budget constraint formed using that measure we establish the existence of and characterize the minimax local measure provide sufficient conditions for the dynamic consumption portfolio problem to have a solution and relate the optimal policies to the solution of quasi linear partial differential equation

expansions in maternity leave coverage and mothers labor market outcomes after childbirth this article analyzes the impact of five major expansions in maternity leave coverage in germany on mothers labor market outcomes after childbirth to identify the causal impact of the reforms we use a difference in difference design that compares labor market outcomes of mothers who give birth shortly before and shortly after a change in maternity leave legislation in years of policy changes and years when no changes have taken place each expansion in leave coverage reduced mothers postbirth employment rates in the short run the longer run effects of the expansions on mothers postbirth labor market outcomes are however small

economies of scale school violence and the optimal size of schools this article argues that policy in relation to education has relied too extensively on the more easily measured costs of production to support a common conclusion of economies of scale in school and or district size it argues that there are external costs that increase with size but that can be measured less easily that offset this case this would imply that the tendency within the education profession to advocate ever larger school sizes is premature at best to make the case it models the choice of school size to emphasize that costs such as school violence born by both students and their parents but not necessarily by education administrators may result in school sizes that are too big from the perspective of school users the second and third parts of the article introduces evidence to suggest that school violence is one of these external costs

catholic schools dropout rates and educational attainment this paper examines the effect of catholic schooling on high school dropout rates and educational attainment particular attention is given to the effect of selection into the catholic school sector after adjusting for self selection we find that sophomores in the catholic schools are still substantially more likely to graduate with their class it is also shown that seniors in the catholic schools are not more likely to acquire more schooling than other seniors if selection is taken into account

the capital gain lock in effect and perfect substitutes abstract this paper analyses the effect of investors accrued capital gains on optimal portfolio composition and equilibrium returns under the assumption that investors are able to re balance with perfect substitute securities no dominance arguments are used to show that pricing differences because of accrued capital gains do not arise among securities which are perfect substitutes these arguments are insufficient however to prevent pricing differences because of accrued capital gains among securities which are not perfect substitutes trading rules are developed which outline the conditions necessary for the realisation of accrued capital gains and the deferral of capital losses these trading rules also provide guidance on which securities investors should sell given their tax basis when re balancing their portfolios

are workers permanently scarred by job displacements this paper investigates whether workers suffer lasting scars following job displacements using david t ellwood s 1982 terminology scars represent persistent effects whereas blemishes are transitory adjustments which dissipate over time more precisely dislocated individuals are defined as scarred if they continue to earn less or to be unemployed more than their nondisplaced counterparts even after the conclusion of a several year adjustment period