economics of a bottleneck abstract drawing on vickrey amer econ rev 59 251 261 1969 and subsequent literature this paper provides a thorough economic analysis of the simplest bottleneck model of road congestion with peak load demand in the morning rush hour a fixed number of identical individuals one per car must travel from home to work between which is a bottleneck of given capacity the costs of travel include queuing time and schedule delay time early or late for work the frequency distribution of departure times adjusts so that in equilibrium all individuals have the same travel costs the paper extends the previous literature by examining a coarse toll and solving for optimal capacities the application of congestion tolls can generate efficiency gains by altering the frequency distribution of departure times previous estimates of the efficiency gains from congestion tolling are likely to be substantially downward biased because they have ignored this effect

measuring and decomposing the gender pay gap a new frontier approach abstract the gender pay gap measures the differences in the wages earned by female workers when compared to male workers accurately measuring the gender pay gap is an important exercise in order to assess how far we are from the ideal of equal pay for work of equal value determining the different sources of the gender pay gap is also very important in order to design appropriate policies for eliminating this gap we develop an enhanced method to measure and decompose the gender pay gap this method is based on the data envelopment analysis dea technique and on the malmquist index mi we use dea and the mi to construct an index reflecting an adjusted measure of the gender pay gap taking into account multiple productive characteristics and multiple types of pay furthermore we propose a decomposition of the gender pay gap into four components same gender pay gap cross gender frontier gap magnitude productive characteristics bias and pay package bias the method is applied to data relative to 15 712 men and 17 175 women working as business and administration associate professionals in the finance and insurance industry in 20 countries the results reveal the existence of a gender pay gap in all countries and that the value of the gap and of its components vary considerably between countries requiring different policies to tackle it

ageing and unused capacity in europe is there an early retirement trap we address the issue of how early retirement may interact with limited use of financial markets in producing financial hardship later in life when some risks such as long term care are not insured we argue that the presence of financially attractive early retirement schemes in a world of imperfect financial and insurance markets can lead to an early retirement trap indeed europe witnesses many early retired individuals in financial distress in our analysis we use data on 10 european countries which differ in their pension and welfare systems in prevailing retirement age and in households access to financial markets we find evidence that an early retirement trap exists particularly in some southern and central european countries people who retired early in life are more likely to be in financial hardship in the long run our analysis implies that governments should stop making early retirement attractive let retirees go back to work improve access to financial markets and make sure long term care problems are adequately insured viola angelini agar brugiavini and guglielmo weber

information technology effects on firm performance as measured by tobin s q despite increasing anecdotal evidence that information technology it assets contribute to firm performance and future growth potential of firms the empirical results relating it investments to firm performance measures have been equivocal however the bulk of the studies have relied exclusively on accounting based measures of firm performance which largely tend to ignore it s contribution to performance dimensions such as strategic flexibility and intangible value in this paper we use tobin s q a financial market based measure of firm performance and examine the association between it investments and firm q values after controlling for a variety of industry factors and firm specific variables the results based on data from 1988 1993 indicate that in all of the five years the inclusion of the it expenditure variable in the model increased the variance explained in q significantly the results also showed that for all five years it investments had a significantly positive association with tobin s q value our results are consistent with the notion that it contributes to a firm s future performance potential which a forward looking measure such as the q is better able to capture

workforce gender effects on firm performance and workers pay evidence for the uk using linked workplace worker data for the uk a number of hypotheses are tested related to individual gender and the gender composition of the workforce the proportion of female workers per establishment is strongly negatively associated with median workplace pay there is some evidence that workplace performance but not employment size or growth is positively associated with the female male workforce ratio for workers the female wage penalty which is substantial is strongly influenced by the female male workforce ratio in addition commensurate with gender discrimination those who manage female workers receive lower wages but professional workers in the same establishments do not

some models for estimating technical and scale inefficiencies in data envelopment analysis in management contexts mathematical programming is usually used to evaluate a collection of possible alternative courses of action en route to selecting one which is best in this capacity mathematical programming serves as a planning aid to management data envelopment analysis reverses this role and employs mathematical programming to obtain ex post facto evaluations of the relative efficiency of management accomplishments however they may have been planned or executed mathematical programming is thereby extended for use as a tool for control and evaluation of past accomplishments as well as a tool to aid in planning future activities the ccr ratio form introduced by charnes cooper and rhodes as part of their data envelopment analysis approach comprehends both technical and scale inefficiencies via the optimal value of the ratio form as obtained directly from the data without requiring a priori specification of weights and or explicit delineation of assumed functional forms of relations between inputs and outputs a separation into technical and scale efficiencies is accomplished by the methods developed in this paper without altering the latter conditions for use of dea directly on observational data technical inefficiencies are identified with failures to achieve best possible output levels and or usage of excessive amounts of inputs methods for identifying and correcting the magnitudes of these inefficiencies as supplied in prior work are illustrated in the present paper a new separate variable is introduced which makes it possible to determine whether operations were conducted in regions of increasing constant or decreasing returns to scale in multiple input and multiple output situations the results are discussed and related not only to classical single output economics but also to more modern versions of economics which are identified with contestable market theories

pension wealth and household saving evidence from pension reforms in the united kingdom using three major u k pension reforms as natural experiments we investigate the relationship between pension saving and discretionary private savings unlike most differences in differences approaches which rely on average differences between control and treatment group we use economic theory to model the response of each individual household the empirical analysis based on the family expenditure survey uses both time series and cross sectional variation to identify the behavioral response the earnings related tier of the pension scheme is found to have a negative impact on private savings with relatively high substitution elasticities the impact of the flat rate tier is not significantly different from zero jel h55 h91 the relationship between pension wealth and household savings is crucial for important policy issues such as establishing the effects of changes in pension legislation on saving behavior from a theoretical point of view the lifecycle framework suggests that the provision of public benefits after retirement constitutes a negative incentive to accumulate wealth during one s working life quantifying the resulting relationship between pension wealth and saving even within a simple theoretical frame

disentangling retirement and savings responses in january 2006 the dutch government implemented a pension reform that substantially reduced the public pension wealth of workers born in 1950 or later at the same time a tax facilitated savings plan was introduced that implied a large savings subsidy for all workers irrespective of birth year this paper uses linked administrative and survey data to assess the effect of the reform on the savings and retirement expectations and realizations of two virtually identical male cohorts that differ only in treatment status the treated having been born in 1950 and the controls having been born in 1949 we show that retirement expectations are in line with realizations and that the reform increased the labor supply for the larger part of the workers namely those without sufficient means to substantially increase private savings to counter the effect of the reform these workers have zero substitution rates between private and public wealth on the other hand there is a group of mostly high wage workers who participate in the tax facilitated savings plan and increase their private savings to fully counter the impact of the drop in public wealth an unintended side effect of the introduction of the tax facilitated savings plan is that high wage earners who are not affected by the drop in pension wealth retire even sooner than initially planned

savings in times of demographic change lessons from the german experience pension reforms in many developed countries make individuals shoulder a bigger share of longevity and income risks the desired response is that individuals accumulate private assets for retirement whether this actually takes place is of paramount relevance for scientists and policy makers we take germany as an example twenty years of pension reform have transformed the monolithic german pension system into a multi pillar system formerly generous public pension benefits are gradually being reduced while substantial incentives are granted to occupational and private saving schemes has this transition worked out we survey the reform steps and household s reactions how did individuals adjust their labor market behavior how did private and occupational pension plans take off how do behavioral adjustments vary in the population most germans adapted to the new situation both actual and expected retirement decisions changedand the share of households without supplementary pensions decreased from 73 to 39 in little more than a decade this is a remarkable success nonetheless households with low education low income and less financial education did neither adjust their retirement behavior nor pick up supplementary pension plans and are thus likely to face difficulties in bridging the gap arising in future pension income

influence of firm performance and gender on ceo compensation in this article we continue the examination of top executive pay by comparing performance total pay and the influence of ceo gender we analyse compensation differences between male and female ceos using nonparametric analysis we calculate the potential compensation for each executive using two benchmarks first each executive s performance and compensation are evaluated relative to members of the same gender to produce a same gender measure of under compensation each executive s compensation is also benchmarked against the other gender s potential compensation producing an other gender measure of under compensation together both measures allow an analysis of the gender specific potential salaries of each executive while controlling for performance the approach is applied to a sample of male and female executives the results indicate that women are under compensated

second best policies for congestion externalities abstract this is the third in a series of three articles on the topic of congestion externalities we use an urban general equilibrium model to test the efficiency of several second best policies for congestion externalities the most efficient second best policy is a program of land use controls the program generates a welfare gain of 3 38 per household per week a unit tax on commuting is a less efficient policy with a welfare gain of 1 15

is there gender discrimination in named professorships an econometric analysis of economics departments in the us south this study examines the correlates of the probability that an individual academician holds a named professorship named professorships like other positions within an organization are determined by a mixture of market and non market forces thus both merit both past and expected future productivity and discrimination may play a role regression results and blinder oaxaca decomposition tests presented here support a conclusion of gender discrimination in the named professorship process at american institutions of higher education specifically it is found that gender discrimination results in a 7 6 percentage point disadvantage for females relative to males regarding the likelihood of holding a named professorship in economics

public transport reliability and commuter strategy we consider the modeling of a bi modal competitive network involving a public transport mode which may be unreliable and an alternative mode commuters select a transport mode and their arrival time at the station when they use public transport the public transport reliability set by the public transport firm at the competitive equilibrium increases with the alternative mode fare via a demand effect this is reminiscent of the mohring effect the study of the optimal service quality shows that often public transport reliability and thereby patronage are lower at equilibrium compared to first best social optimum the paper provides some public policy insights

pension wealth and household savings tests of robustness abstract a substantial literature exists on the impact of pension schemes both public and private on the level of household saving yet there is no clear consensus on the impact of pensions on private saving in this paper we show how beliefs about this displacement effect are modified by prior beliefs both about variables which might be relevant in an equation for private savings and about the magnitude of the displacement effect using data for 8279 canadian households and estimates of pension wealth both private and social security which we construct for each household in the sample the estimated displacement effects are found to be relatively robust with respect to both types of prior belief

tenure promotion and executive remuneration commentators frequently remark on the need to pay high levels of chief executive officer remuneration to attract motivate and retain the best executives for britain s leading companies this paper presents the results of an empirical investigation into tenure promotion and executive remuneration the remuneration of the chief executive officers at some of britain s largest businesses is examined in the majority of cases the ceo had not been lured away from rivals but had risen through the internal labour market often after a long term employment relationship moreover long job tenure and internal promotion were associated with higher levels of pay it is concluded that understanding of this controversial issue will be improved if it is recognized that a part of current executive pay may be a reward for previous successful performance

trade credit and the propagation of corporate failure an empirical analysis using an exhaustive data set on claims held by trade creditors suppliers on failed trade debtors customers we quantify the importance of trade credit chains for the propagation of corporate bankruptcy we show that trade creditors experience significant trade credit losses due to trade debtor failures and that creditors bankruptcy risks increase in the size of incurred losses by exploring the roles of financial constraints and creditor debtor dependences we infer that the trade credit failure propagation mechanism is driven by both credit losses and demand shrinkage finally we show that the documented propagation mechanism constitutes a significant part of the overall bankruptcy frequency suggesting that it has measurable implications for the aggregate level

tobin s q and the gains from takeovers this paper analyzes the relation between takeover gains and the q ratios of targets and bidders for a sample of 704 mergers and tender offers over the period 1972 1987 target bidder and total returns are larger when targets have low q ratios and bidders have high q ratios the relation is strengthened after controlling for the characteristics of the offer and the contest this evidence confirms the results of the work by lang stulz and walkling and shows that their findings also hold for mergers and after controlling for other determinants of takeover gains in a recent paper lang stulz and walkling lsw 1989 document that the abnormal returns in tender offers are related to the tobin s q ratios of the targets and the bidders in particular they find that target bidder and total returns are higher when takeover targets have high q ratios and bidders have low q ratios where one is used as a cutoff point to separate high q firms from low q firms in fact bidders with high q ratios have significant positive abnormal returns when they engage in a takeover while bidders with low q ratios have significant negative abnormal returns the best takeovers in terms of value creation are those where a high q firm takes over a low q firm the opposite scenario holds for the worst case takeovers low q firms taking over high q firms if q is interpreted as a measure of managerial performance these findings imply that better performing firms also make better acquisitions and that more value can be created from taking over poorly performing companies while the results of lsw are insightful they leave a number of questions unanswered their sample consists only of tender offers several studies have documented that the returns to targets in mergers are smaller than those in tender offers see jensen and ruback 1983 and huang and walkling 1987 it would therefore be useful to see whether the lsw 1989 results hold for a larger sample which includes both mergers and tender offers previous research has also shown that the characteristics of the takeover hostile versus friendly and single versus multiple bidder the form of payment cash versus securities the time period before 1968 1968 1980 1981 and later and the relative size of target and bidder are important determinants of the magnitude of takeover gains and their distribution

women s wages in women s work a u s canada comparison of the roles of unions and public goods sector jobs in this paper we investigate the mechanism by which the femaleness of occupations has a negative effect on women s wages we relate us canada differences in labor market institutions the returns to skills and other dimensions of the wage structure such as occupational rents to corresponding differences in the rewards to female jobs our analysis which uses us data from the cps org for 1988 and canadian data from the 1988 lmas uncovers intriguing us canada differences in the effect of occupational gender composition on women s wages the estimated effect for canadian women is generally small and not statistically significant while estimates for american women are relatively large and comparable to the evidence in previous studies relating these differences to cross country variation in other wage determinants reveals that higher rates of unionization and the higher occupation wage effects for certain public good sector jobs such as educational services work to the advantage of canadian women we also find that the relatively higher pay of integrated jobs in the united states helps account for the larger negative effect of gender composition on women s wages in this country dans cet article nous etudions le mecanisme par lequel le taux de feminite des occupations peut avoir un effect negatif sur les salaires des femmes nous utilisons une comparaison internationale etats unis canada pour relier les differences institutionnelles du marche du travail les differences dans les rendements des qualifications et dans d autres dimensions de la structure salariale comme les rentes occupationnelles a des differences dans la remuneration des emplois a predominance feminine notre analyse qui utilise les donnees americaines provenant des cps org pour 1988 et les donnees canadiennes provenant de l enquete sur l activite aussi pour 1988 demontre l existence de differences interessantes entre les etats unis et le canada quant a l effet du taux de feminite des occupa this abstract was borrowed from another version of this item

are ceos really paid like bureaucrats a common view is that there is little correlation between firm performance and ceo pay using a new fifteen year panel data set of ceos in the largest publicly traded u s companies we document a strong relationship between firm performance and ceo compensation this relationship is generated almost entirely by changes in the value of ceo holdings of stock and stock options in addition we show that both the level of ceo compensation and the sensitivity of compensation to firm performance have risen dramatically since 1980 largely because of increases in stock option grants

pensions and household wealth accumulation abstract economists have long suggested that higher private pension benefits crowd out other sources of household wealth accumulation we exploit detailed information on pensions and lifetime earnings for older workers in the 1992 wave of the health and retirement study and employ an instrumental variable iv identification strategy to estimate crowd out the iv estimates suggest statistically significant crowd out each dollar of pension wealth is associated with a 53 67 cent decline in nonpension wealth with less precision we use an instrumental variable quantile regression estimator and find that most of the effect is concentrated in the upper quantiles of the wealth distribution

the economics of crowding in rail transit abstract we model trip timing decisions of rail transit users who trade off crowding costs and disutility from traveling early or late with no fare or a uniform fare ridership is too concentrated on timely trains marginal cost pricing calls for time dependent fares that smooth train loads and generate more revenue than an optimal uniform fare the welfare gains from time dependent fares are unlikely to increase as ridership grows however imposing time dependent fares raises the benefits of expanding capacity by either adding trains or increasing train capacity we illustrate these results by calibrating the model to the paris rer a transit system

the effects of pensions on household wealth a reevaluation of theory and evidence this paper examines the extent to which households offset pension wealth with reductions in other wealth systematic econometric biases imply that the estimated offsets in previous empirical studies are smaller than the true offset and may even have the wrong sign new empirical estimates that do not correct for the biases generate little offset between pensions and other wealth estimates that correct for the biases show substantially more offset a smaller impact of pensions on overall saving than in most previous studies the estimates also indicate that the effects of pensions on wealth vary significantly across households

financial decision making are women really more risk averse 40 males 33 females gain gambling gain domain loss gambling loss domain a contextual frames b abstract gambling frames studies the application of experimental methods provided stronger control of the economic environment in which decisions were made we elicited data which call into question the prevalence of stereotypic risk attitudes in financial decision making first we find that the comparative risk propensity of male and female subjects is strongly dependent on the financial decision setting second and more important we observe no gender differences in risk propensity when subjects face contextual decisions since in practice financial decisions are always contextual our results suggest that the above gender stereotype may not reflect true male and female attitudes toward financial risks i gender specific risk behavior an experimental design our experiment was designed to examine gender specific risk propensity in decisions relevant for investors and managers table 1 gives an overview of the experimental design in the main treatment we implemented risky choices in the form of investment and insurance decisions choice behavior in this treatment henceforth called the context treatment directly measures the risk behavior of male and female subjects in contextual financial decisions we also ran a control treatment in which the same risky choices were presented as abstract gambling decisions this control treatment henceforth called the abstract treatment allows us to validate the risk behavior induced by our experimental procedure in the light of the above mentioned gambling evidence in the context treatment subjects were confronted with risky choices in two different decision contexts subjects first had to complete a series of investment decisions they were then presented with a series of identical choices this time however framed as insur1 wealth effects from income differences outside the laboratory may still affect risk behavior in our experiment they are controlled for in our model 2 experimental instructions are available in german from the authors or in english from our web page www wif ethz ch publikationen htm ance decisions each investment and insurance decision incorporated a choice between a risky lottery and a certain payoff with the series of choices implemented in the two frames we elicited our subjects certainty equivalents for the same four risky lotteries l1 l2 l3 l4 in both contexts we implemented two frames in the context treatment in order to measure the risk propensity of subjects toward both perceived gains and perceived losses in both frames all possible payoffs for each decision were positive in the investment frame these payoffs were also presented as gains while in the insurance frame the same payoffs were presented as losses relative to an initial endowment therefore elicited certainty equivalents in the investment frame measure subjects risk propensities in the gain domain while certainty equivalents in the insurance frame measure risk propensity in the loss domain if in contextual financial decisions female subjects are generally more risk averse than men our results should display ceteris paribus lower female certainty equivalents in both the investment and insurance frames 3 the four lotteries l1 l2 l3 and l4 each had two possible outcomes payoffs in swiss francs 1 sfr a 0 60 and their probabilities were 30 sfr 6 10 sfr 6 30 sfr 2 10 sfr 2 30 sfr 6 10 sfr 6 and 50 sfr 2 20 sfr 2 respectively 4 experimental evidence suggests that individual risk propensity will vary systematically between the gain and loss domain daniel kahneman and amos tversky 1979 383 vol 89 no 2 gender and economic transactions 3y16 my68 mp 383 friday dec 10 08 20 am lp aer my68 figure 1 differences in mean certainty equivalents ce between male and female subjects by frame note certainty equivalents and male female differences are measured in swiss francs in the abstract treatment we confronted a different group of subjects with exactly the same risky decisions as those in the main treatment however as mentioned before all choices in this control treatment were framed as abstract gambling decisions again two frames were implemented in the gaingambling and loss gambling frames we measured the risk attitudes of subjects toward gambles in the gain and loss domain respectively subjects in both treatments were told in advance that one of their choices would determine their experimental earnings further all subjects completed a post experimental questionnaire which yielded information on each subject s disposable income this information is necessary to exclude wealth effects due to income differences outside the laboratory as an explanation of gender specific choice behavior

social security and households saving this paper provides new evidence on the substitutability between private and pension wealth by exploiting the italian pension reform of 1992 we use a difference in difference estimator that exploits the differential effects of the reform on individuals belonging to several yea of birth cohorts and different occupational groups we find convincing evidence that saving rates increase as a result of a reduction in pension wealth by allowing for the possibility that substitutability changes with age we find that substitutability is particularly high and precisely estimated for workers between 35 and 45

pension wealth and individual saving some new evidence attemprs to measure the tmpact of soctal security and private pensions on household saving have occupied much of the literature in empirical public finance over the past decade empirical estimates of those impacts have been quite varied see the discussion in aaron 1982 this paper provides new estimates of the impact of changes in holdings of social security and private pension annuities on the level of non pension wealth the data examined are drawn from surveys conducted for the u s president s commission on pension policy the impact of the social security system on individual saving has been a concern since feldstein s 1974 pioneering paper l the theoretical argument of feldstein and of barro 1974 1978 centers around the funding status of social security i e the degree to which an unfunded social security system reduces private saving empirical tests of the effects of social security on saving in this line of research have been conducted in the perfect certainty version of the life cycle model modigliani and ando 1957 modigliani and brumberg 1954 in that approach social security affects non pension saving through its impact on individual intertemporal budget constraints disposable income during the working period falls by the amount of

reward design and ceo succession in the uk previous research has shown that top executives often rise to the peak of their organizations after a long term employment relationship and that internal promotion to the top is reflected in enhanced baseline salaries using data from a representative sample of uk companies the links between the fixed and variable elements of the chief executive officer s compensation package are examined and whether the appointment has been promoted internally or recruited from outside of the company from this analysis it is concluded that the positive impact on basic pay of elevation to the top job from within the company is not present in total compensation or the structure of pay it also emerges that although tenure does not significantly impact on the structure of pay it does alter total reward through its impact on the value of options granted longer company tenure reduces both the award of share options and the total value of the remuneration package job tenure on the other hand raises the executive s rew

explaining the wealth holdings of different cohorts productivity growth and social security in this paper we explore the reasons why different generations accumulate different amounts of wealth we use basic economic theory to propose two indicators of the economic conditions under which households accumulate wealth the first one represents productivity differences across cohorts the aggregate level of gross national product per capita around the time the head of the household entered the labor market the second measure summarizes the changes in social security during the head of household s working life using panel data from the dutch socio economic panel we show that productivity growth can explain all the cohort effects present in income data while productivity growth and the generosity of social security can explain all the cohort effects present in household net worth we also find a limited offset of social security on wealth holdings

pension wealth and household savings in europe evidence from sharelife we use recently collected retrospective survey data to estimate the displacement effect of pension wealth on household savings the third wave of the survey of health ageing and retirement in europe sharelife collects information on the entire job history of the respondent a feature missing in most previous studies we show that addressing measurement error problems is crucial to estimate the displacement effect when using survey data we find that each euro of pension wealth is associated with a 47 61 cent decline in non pension wealth using robust median regression in the presence of biases from measurement errors and omitted unobserved variables we estimate a lower bound to the true offset between 17 and 30 significantly different from zero instrumental variables regression estimates although less precise suggest full displacement