long term intergenerational persistence of human capital an empirical analysis of four generations most previous studies of intergenerational transmission of human capital are restricted to two generations how parents influence their children in this study we use a swedish data set that links individual measures of lifetime earnings for three generations and data on educational attainment for four generations we find that estimates obtained from data on two generations severely underestimate long run intergenerational persistence in both labor earnings and educational attainments long run social mobility is hence much lower than previously thought we attribute this additional persistence to dynastic human capital the influence on human capital of more distant family members than parents

clearly irrational financial market behavior evidence from the early exercise of exchange traded stock options this paper analyzes the early exercise of exchange traded options by different classes of investors over the 1996 to 1999 period a large number of exercises are identified as clearly irrational without invoking any model of market equilibrium customers of discount brokers and customers of full service brokers both engage in a significant number of irrational exercises while traders at large investment houses exhibit no irrational early exercise behavior rational and irrational exercise is triggered for discount and full service customers by the underlying stock price attaining its highest level over the past year and by high returns on the underlying stock it is well known that in the absence of market frictions it is irrational to exercise american call options early except in some circumstances just before the underlying stock goes ex dividend even in the presence of market frictions it is possible to identify without the imposition of any model of market equilibrium call exercises that are clearly irrational in this paper we employ a previously unavailable data set to analyze the rationality of early exercises of chicago board option exchange cboe calls over the 1996 to 1999 period by customers of discount brokers discount customers customers of full service brokers full service customers and traders at large investment houses trading for their firms own accounts firm proprietary traders our first main finding is that there are a large number of early exercises that can be definitively identified as irrational and irrational exercise activity is not evenly distributed across the investor classes discount customers and full ser

input demand under yield and revenue insurance previous studies disagree on the effects of insurance on fertilizer application rates the effect of increased fertilizer on the probability of low yields primarily determines whether fertilizer and insurance are substitutes or complements we estimate conditional distributions of corn yields to determine if the technical relationship between yields and fertilizer supports the hypothesis that insurance increases optimal application rates our results indicate no support for this hypothesis at all nitrogen fertilizer rates and reasonable levels of risk aversion nitrogen fertilizer and insurance are substitutes suggesting that those who purchase insurance are likely to decrease nitrogen fertilizer applications

psychological factors and stock option exercise we investigate stock option exercise decisions by over 50 000 employees at seven corporations controlling for economic factors psychological factors influence exercise consistent with psychological models of beliefs employees exercise in response to stock price trends exercise is positively related to stock returns during the preceding month and negatively related to returns over longer horizons consistent with psychological models of values that include reference points employee exercise activity roughly doubles when the stock price exceeds the maximum price attained during the previous year

can economic incentives encourage actual reductions in pesticide use and environmental spillovers chemical pesticides constitute an important input in crop production but their indiscriminate use can impact negatively agricultural productivity human health and the environment recently attention is focused on the use of economic incentives to reduce pesticide use and its related indirect effects the aim of this work is to assess the effectiveness of different economic instruments such as taxes and levies in encouraging farmers to decrease pesticide use and their environmental spillovers a policy simulation model is employed using data from dutch cash crop producers including two pesticide categories that differ in terms of toxicity and pesticides environmental spillovers four different instruments were selected for evaluation pesticide taxes price penalties on pesticides environmental spillovers subsidies and quotas the results of the study indicate that even high taxes and penalties would result in a small decrease in pesticide use and environmental spillovers taxes that differentiate according to toxicity do not lead to substitution of high with low toxicity pesticides subsidies on low toxicity products are not able to affect the use of high toxicity products pesticide quotas are more effective in reducing pesticide use and environmental spillovers

replacement of agricultural price supports by area payments in the european union and the effects on pesticide use this article determines the contribution of recent european union agricultural policy reforms on the use of pesticides our theoretical model extends the multioutput generalization of the lichtenberg zilberman damage control technology model developed by chambers and lichtenberg our empirical analysis uses farm level data for a sample of french farms results suggest that price effects on the use of pesticides are always more elastic than area payment effects this indicates that policy reforms consisting of a reduction in price supports in favor of area payments may reduce application of crop protection inputs such policy changes which represent a certain degree of decoupling took place under the 1992 common agricultural policy reforms

risk preferences and pesticide use by cotton farmers in china abstract despite that insect resistant bt cotton has been lauded for its ability to reduce the use of pesticides studies have shown that chinese bt cotton farmers continue to use excessive amounts of pesticides using results from a survey and an artefactual field experiment we find that farmers who are more risk averse use greater quantities of pesticides we also find that farmers who are more loss averse use lesser quantities of pesticides this result is consistent with our conceptual framework and suggestive evidence where farmers behave in a loss averse manner in the health domain and place more weight on the importance of health over money in the loss domain

the origins of intergenerational associations lessons from swedish adoption data we use unique swedish data with information on adopted children s biological and adoptive parents to estimate intergenerational mobility associations in earnings and education we argue that the impact from biological parents captures broad prebirth factors including genes and prenatal environment and the impact from adoptive parents represents broad postbirth factors such as childhood environment we find that both pre and postbirth factors contribute to intergenerational earnings and education transmissions and that prebirth factors are more important for mother s education and less important for father s income we also find some evidence for a positive interaction effect between postbirth environment and prebirth factors

the econometrics of damage control why specification matters the contribution of damage control agents to production differs fundamentally from that of standard inputs lands labor capital this paper develops an econometric model based on the key characteristics of damage control agents and examines its properties it demonstrates that standard production function specifications overestimate damage control agent productivity and have erroneous implications for the evolution of damage control agent productivity and use in response to changing environments e g the spread of pest resistance it also proposes several alternative specifications and discusses methods for estimating them

like grand parent like child multigenerational mobility across the eu abstract this study shows that the multigenerational transmission of inequality in most of the 28 eu countries is higher than what a parent to child paradigm would suggest while a strand of the literature claims that this is due to a direct grandparental effect economic historian gregory clark argues that multigenerational mobility follows a markovian process in his view not only are previous estimates severely attenuated by an errors in variables problem but persistence is also constant across time and space using a unique retrospective survey containing information on three generations of european citizens we provide suggestive evidence against such a universal law of mobility while estimates based on measurement error models show that persistence is indeed as strong as clark suggests there are cross country differences furthermore for a few eu countries we cannot reject the hypothesis of a direct grandparental effect overall there is no single data generating process to describe multigenerational persistence that fits all eu countries 2

skewness preference and the popularity of technical analysis abstract we propose a simple model of how investors evaluate a trading rule and show that the market timing of technical trading rules induces lottery like trading profits therefore investors preference for positive skewness caters to the popularity of technical analysis since prospect theory implies strong skewness preference it can explain why investors trade extensively on chart patterns that are meaningless in light of the efficient market hypothesis technicians often invoke behavioral finance as its theoretical foundation contrary to this view we show that ideas from behavioral finance explain why technical analysis is popular despite the lack of theoretical foundation and empirical success

the transmission of inequality across multiple generations testing recent theories with evidence from germany this article shows that across multiple generations the persistence of occupational and educational attainment in germany is larger than estimates from two generations suggest we consider two recent interpretations first we assess gregory clark s hypotheses that the true rate of intergenerational persistence is higher than the observed rate as high as 0 75 and time invariant our evidence supports the first but not the other two hypotheses second we test for independent effects of grandparents we show that the coefficient on grandparent status is positive in a wide class of markovian models and present evidence against its causal interpretation

prospect theory liquidation and the disposition effect there is a well known intuition linking prospect theory with the disposition effect the tendency of investors to sell assets that have risen in value rather than fallen recently several authors have studied rigorous models in an attempt to formalize the intuition however some have found it difficult to predict a disposition effect while others produce a more extreme prediction where investors never voluntarily sell at a loss we solve a model of asset liquidation where investors realize utility over gains and losses and utility is concave over gains and convex over losses under the preferences of tversky and kahneman tversky a d kahneman 1992 advances in prospect theory cumulative representation of uncertainty j risk uncertainty5 4 297 323 and lognormal asset prices investors exhibit a disposition effect as gains are realized at a greater rate than losses nonetheless in contrast to the extant literature we find that the investor will give up and sell at a loss when the asset has a sufficiently low sharpe ratio this paper was accepted by brad barber teck ho and terrance odean special issue editors

optimal portfolio choice under loss aversion this paper analyzes the optimal investment strategy for loss averse investors assuming a complete market and general ito processes for the asset prices the loss averse investor follows a partial portfolio insurance strategy when the investor s planning horizon is short less than 5 years he or she considerably reduces the initial portfolio weight of stocks compared to an investor with smooth power utility the empirical section of the paper estimates the level of loss aversion implied by historical u s stock market data using a representative agent model we find that loss aversion and risk aversion cannot be disentangled empirically

optimal exercise of executive stock options and implications for firm cost this paper conducts a comprehensive study of the optimal exercise policy for an executive stock option and its implications for option cost average life and alternative valuation concepts the paper is the first to provide analytical results for an executive with general concave utility wealthier or less risk averse executives exercise later and create greater option cost however option cost can decline with volatility we show when there exists a single exercise boundary yet demonstrate the possibility of a split continuation region we also show that for constant relative risk averse utility the option value does not converge to the black and scholes value as the correlation between the stock and the market portfolio converges to one we compare our model s option cost with the modified black and scholes approximation typically used in practice and show that the approximation error can be large or small positive or negative depending on firm characteristics

prospect theory and the disposition effect this paper shows that prospect theory is unlikely to explain the disposition effect prospect theory predicts that the propensity to sell a stock declines as its price moves away from the purchase price in either direction trading data on the other hand show that the propensity to sell jumps at zero return but it is approximately constant over a wide range of losses and increasing or constant over a wide range of gains further the pattern of realized returns does not seem to stem from optimal after tax portfolio rebalancing a belief in mean reverting returns or investors acting on target prices

the contribution of genetic modification to changes in corn yield in the united states we use a large rich dataset compiled from results of university extension trials to estimate the contribution of genetic modification gm to changes in corn yield in the united states from timea to timeb through repeated experimental trials we obtain consistent estimates of the effect of these traits by using both the hausman taylor estimator and a comparison of fixed effects estimates analogous to the agronomic practice of comparing near isolines our results suggest that gm traits had a positive impact on yield but that gains associated with combining several gm traits in one hybrid are not necessarily additive

intergenerational occupational mobility in great britain and the united states since 1850 abstract the us tolerates more inequality than europe and believes its economic mobility is greater than europe s though they had roughly equal rates of intergenerational occupational mobility in the late twentieth century we extend this comparison into the nineteenth century using 10 000 nationally representative british and us fathers and sons the us was more mobile than britain through 1900 so in the experience of those who created the us welfare state in the 1930s the us had indeed been exceptional the us mobility lead over britain was erased by the 1950s as us mobility fell from its nineteenth century levels jel j62 n31 n32 n33 n34

portfolio choice and trading volume with loss averse investors this paper presents a model of portfolio choice and stock trading volume with lossaverse investors the demand function for risky assets is discontinuous and non monotonic as wealth rises beyond a threshold investors follow a generalized portfolio insurance strategy this behavior is consistent with the evidence in favor of the disposition effect in addition loss averse investors will not hold stocks unless the equity premium is quite high the elasticity of the aggregate demand curve changes substantially depending on the distribution of wealth across investors in an equilibrium setting the model generates positive correlation between trading volume and stock return volatility but suggests that this relationship should be non linear

risk managing tail risk seekers var and expected shortfall vs s shaped utility abstract we consider market players with tail risk seeking behaviour modelled by s shaped utility as introduced by kahneman and tversky we argue that risk measures such as value at risk var and expected shortfall es are ineffective in constraining such players as such measures cannot reduce the traders expected s shaped utilities indeed when designing payoffs aiming to maximize utility under a var or es risk limit the players will attain the same supremum of expected utility with or without var or es limits by contrast we show that risk management constraints based on a second more conventional concave utility function can reduce the maximum s shaped utility that can be achieved by the investor indeed product designs leading to progressively larger s shaped utilities will lead to progressively lower expected constraining conventional utilities violating the related risk limit these results hold in a variety of market models including the black scholes options model and are particularly relevant for risk managers given the historical role of var and the endorsement of es by the basel committee in 2012 2013

intergenerational mobility in the very long run florence 1427 2011 we examine intergenerational mobility in the very long run across generations that are six centuries apart we exploit a unique dataset containing detailed information at the individual level for all people living in the italian city of florence in 1427 these individuals have been associated using their surnames with their pseudo descendants living in florence in 2011 we find that earnings elasticity is about 0 04 much higher than predicted by traditional models of intergenerational mobility we also find an even stronger role for real wealth inheritance and evidence of persistence in belonging to certain elite professions our results are confirmed when we account for the quality of the pseudo links and when we address the potential selectivity bias due to the differential survival rates across surnames we argue that the quasi immobility of pre industrial society and the positional advantages in the access to certain professions might explain in part the long lasting effects of ancestors socioeconomic status

intergenerational education mobility and the level of development abstract the main goal of this paper is to analyze the empirical relationship between economic development and intergenerational education mobility by exploiting large regional variation in the level of economic development across turkey we find that educational outcomes of daughters who grow up in more developed regions depend less on their parents educational outcomes we do not find evidence for a similar relationship between development and mobility for males moreover the development level of place of residence during childhood has a stronger positive association with intergenerational education mobility compared to the development level of place of residence during adolesence we find that regions that feature higher school availability greater level of social capital more favorable cultural attitudes toward women higher level of home resources and lower degree of educational inequalities also tend to feature higher degree of intergenerational mobility

roundup ready soybeans in argentina farm level and aggregate welfare effects although adoption rates of genetically modified crops have been staggering in some countries there is still comparatively little evidence about biotechnology impacts under diverse agroecological and institutional conditions these knowledge gaps lead to an overly precautious attitude among policy makers and the public this article analyzes the effects of roundup ready rr soybeans in argentina the country with the second biggest transgenic area worldwide based on recent survey data it is shown that the technology increases total factor productivity by 10 on average with cost savings being somewhat more pronounced for smaller than for larger farms the reduction in use of toxic herbicides and of tillage operations entails positive environmental repercussions aggregate welfare effects are computed over the 1996 2001 period with a three region partial equilibrium model comprising argentina the united states and the rest of the world in 2001 rr soybeans created more than us 1 2 billion of economic surplus at the global level the largest share went to consumers 53 followed by seed and biotechnology firms 34 and agricultural producers 13 due to comparatively weak intellectual property protection and thus only small technology mark ups in seed prices and widespread adoption argentine soybean growers receive 90 of the benefits in that country this demonstrates that farmers in developing countries can gain considerably when they obtain access to suitable foreign innovations through technology spill overs

the informational content of surnames the evolution of intergenerational mobility and assortative mating we propose a new methodology for measuring intergenerational mobility in economic well being our method is based on the joint distribution of surnames and economic outcomes it circumvents the need for intergenerational panel data a long standing stumbling block for understanding mobility it does so by using cross sectional data alongside a calibrated structural model to recover the traditional intergenerational elasticity measures our main idea is simple if inheritance is important for economic outcomes then rare surnames should predict economic outcomes in the cross section this is because rare surnames are indicative of familial linkages if the number of rare surnames is small this approach will not work however rare surnames are abundant in the highly skewed nature of surname distributions from most western societies we develop a model that articulates this idea and shows that the more important is inheritance the more informative will be surnames this result is robust to a variety of different assumptions about fertility and mating we apply our method using the 2001 census from catalonia a large region of spain we use educational attainment as a proxy for overall economic well being a calibration exercise results in an estimate of the intergenerational correlation of educational attainment of 0 60 we also find evidence suggesting that mobility has decreased among the different generations of the 20th century a complementary analysis based on sibling correlations confirms our results and provides a robustness check on our method our model and our data allow us to examine one possible explanation for the observed decrease in mobility we find that the degree of assortative mating has increased over time overall we argue that our method has promise because it can tap the vast mines of census data that are available in a heretofore unexploited manner

pests and pesticides risk and risk aversion abstract theoretical and applied literature on risk in decision making for agricultural pest control is reviewed risk can affect pesticide decision making either because of risk aversion or because of its influence on expected profit it is concluded that risk does not necessarily lead to increased pesticide use by individual farmers uncertainty about some variables such as pest density and pest mortality does lead to higher optimal pesticide use under risk aversion however uncertainty about other important variables such as output price and yield leads to lower optimal levels of pesticide use neglect of these variables in most studies has led to the false assumption that pesticides are always risk reducing inputs furthermore there is evidence that in general the pesticide dosage which maximises expected profit is lower under risk than under certainty depending on the balance of forces to increase and decrease pesticide use under risk in many circumstances the net effect of risk on optimal decision making for pest control may be minimal the effect on risk of information about pest density and other variables as in integrated pest management programmes is discussed evidence on this issue is mixed a range of analytical techniques for analysing risk in pest control is reviewed throughout the paper gaps in the existing literature are identified

the economics of biotechnology under ecosystem disruption abstract economic analysis of chemical pesticide use has shown that the interactions between plants pests damage control technology and state of the ecosystem are important variables to be considered hence a bio economic model was developed for the assessment of bt variety and pesticide based control strategies of the cotton bollworm in china the model simulates plant growth the dynamics of pest populations and of natural enemies the model predictions are used as major inputs for a stochastic micro level profit model of alternative control strategies results show that 1 productivity effects of bt varieties and pesticide use depend on the action of natural control agents and 2 the profitability of damage control measures increases with the severity of ecosystem disruption the findings highlight the importance of the choice of the counterfactual scenario in the assessment of the impact of agricultural biotechnology also some doubts are raised whether the high benefits of bt cotton varieties claimed by previous studies based on cross section comparisons are realistic

the econometrics of damage control lichtenberg and zilberman argue correctly that when biological and physical processes are considered we are able to delineate two components of actual realized crop yields potential output the maximum quantity of product obtainable from any given combination of inputs and losses caused by damaging agents present in the environment p 262 they further argue that damage control agents should be defined in terms of their contribution to the abatement effort and hence should enter the production function as an argument of the damage abatement function to demonstrate the consequences of their claims lichtenberg and zilberman make an ad hoc choice of a cobb douglas functional form for crop yield exogenous factors such as pest prevalence and weather conditions are ignored although they note that omission of these environmental factors will result in misspecification of the production relationship p 267

until the bitter end on prospect theory in a dynamic context many economic and financial decisions depend crucially on their timing people decide when to invest in a project when to liquidate assets or when to stop gambling in a casino we provide a general result on prospect theory decision makers who are unaware of the time inconsistency induced by probability weighting if a market offers a sufficiently rich set of investment strategies then such naive investors postpone their stopping decisions indefinitely we illustrate the drastic consequences of this never stopping result and conclude that probability distortion in combination with naivete leads to unrealistic predictions for a wide range of dynamic setups

intergenerational wealth mobility in england 1858 2012 surnames and social mobility this article uses a panel of 18 869 people with rare surnames whose wealth is observed at death in england and wales 1858 2012 to measure the intergenerational elasticity of wealth over five generations we show using rare surnames to track families that wealth is much more persistent than standard one generation estimates would suggest there is still a significant correlation between the wealth of families five generations apart we show that this finding can be reconciled with standard estimates of wealth mobility by positing an underlying first order markov process of wealth inheritance with an intergenerational elasticity of 0 70 0 75 throughout the years 1858 2012

take a risk preferring prevention over control of biological invaders abstract scientists have argued that invasive species can be managed most cost effectively with greater investments in prevention further under ideas like the precautionary principle it is reasonable to expect that a cautious manager would use more prevention relative to control because it keeps more invaders out yet this is not typically done in many cases private and public resources are invested primarily to control existing invaders rather than to prevent new invasions managers frequently wait until after invaders have arrived and then scramble to limit the damages we believe these paradoxical decisions can be understood by recognizing the link between typical human preferences for risk bearing and the technology of risk reduction we demonstrate quantitatively how managers perceived to be cautious or averse to risk tend to shy away from prevention relative to control this counterintuitive result arises because control is a safer choice than prevention because its productivity is relatively less risky it works to remove existing invaders from the system in contrast the productivity of prevention is more uncertain because prevention only reduces the chance of invasion it does not eliminate it and invasion may not occur even in the absence of prevention managers averse to risk will inherently avoid as much uncertainty as possible whether the source of uncertainty regards ecological outcomes or economic productivity implications for environmental decision making are clear in invasive species management if managers act as though they are risk averse their caution can backfire when it leads to more control rather than prevention the social consequences of this choice are a greater probability of future invasions and lower social welfare our results suggest that social welfare is highest when managers were willing to take a risk with prevention

can gm technologies help the poor the impact of bt cotton in makhathini flats kwazulu natal abstract the results of a two year survey of smallholders in makhathini flats kwazulu natal show that farmers who adopted bt cotton in 1999 2000 benefited according to all the measures used higher yields and lower chemical costs outweighed higher seed costs giving higher gross margins these measures showed negative benefits in 1998 99 which conflicts with continued adoption but stochastic efficiency frontier estimation which takes account of the labor saved showed that adopters averaged 88 efficiency as compared with 66 for the nonadopters in 1999 2000 when late rains lowered yields the gap widened to 74 for adopters and 48 for nonadopters

risk aversion and block exercise of executive stock options abstract it is well documented that executives granted stock options tend to exercise early and in a few large transactions or blocks standard risk neutral valuation models cannot explain these patterns and attempts to capture the exercise behavior of risk averse executives have been limited to the special case of one option this paper solves for the optimal exercise behavior for a risk averse executive who is granted multiple stock options we show that utility based models do not predict block exercise behavior rather the risk averse executive exercises stock options individually at a sequence of increasing price thresholds when in addition the executive faces frictions such as costly exercise he faces a trade off between exercising little and often to maximize return and exercising larger quantities on fewer occasions to minimize effort this generates realistic block exercise behavior and yields new predictions in particular executives should begin by exercising large blocks of options but the block sizes should become smaller over time our framework also allows us to study the impact of multiple exercise dates on estimates of the cost of options to the company we find that assuming the executive can only exercise on a single occasion underestimates the cost of the options compared with allowing for optimal exercise behavior

intergenerational wealth mobility and the role of inheritance evidence from multiple generations this study estimates intergenerational correlations in mid life wealth across three generations and a young fourth generation and examines how much of the parent child association that can be explained by inheritances using a swedish data set we find parent child rank correlations of 0 3 0 4 and grandparents grandchild rank correlations of 0 1 0 2 conditional on parents wealth grandparents wealth is weakly positively associated with grandchild s wealth and the parent child correlation is basically unchanged if we control for grandparents wealth bequests and gifts strikingly account for at least 50 per cent of the parent child wealth correlation while earnings and education are only able to explain 25 per cent

valuing financial health and environmental benefits of bt cotton in pakistan data from a farm survey and choice experiment are used to value the benefits of bt cotton in pakistan unlike previous research on the economic impacts of bt which mostly concentrated on financial benefits in terms of gross margins we also quantify and monetize positive externalities associated with technology adoption due to lower chemical pesticide use on bt cotton plots there are significant health advantages in terms of reduced incidence of acute pesticide poisoning and environmental advantages in terms of higher biodiversity and lower soil and groundwater contamination these positive externalities are valued at us 79 per acre of which half is attributable to health and the other half to environmental improvements adding average gross margin gains of us 204 results in an aggregate benefit of us 283 per acre of bt or us 1 7 billion for the total bt cotton area in pakistan

prospect theory and liquidation decisions we solve a liquidation problem for an agent with preferences consistent with the prospect theory of kahneman and tversky econometrica 47 1979 263 291 we find that the agent is willing to hold a risky project with a relatively inferior sharpe ratio if the project is currently making losses and intends to liquidate it when it breaks even on the other hand the agent may liquidate a project with a relatively superior sharpe ratio if its current profits rise or drop to the break even point our results capture the spirit of the disposition effect and the break even effect documented in empirical and experimental studies

ambiguity attitudes in a large representative sample using a theorem showing that matching probabilities of ambiguous events can capture ambiguity attitudes we introduce a tractable method for measuring ambiguity attitudes and apply it in a large representative sample in addition to ambiguity aversion we confirm an ambiguity component recently found in laboratory studies a insensitivity the tendency to treat subjective likelihoods as 50 50 thus overweighting extreme events our ambiguity measurements are associated with real economic decisions specifically a insensitivity is negatively related to stock market participation ambiguity aversion is also negatively related to stock market participation but only for subjects who perceive stock returns as highly ambiguous this paper was accepted by james smith decision analysis

sprayed to death path dependence lock in and pest control strategies theoretical literature on the economics of technology has emphasized the effects on technological trajectories of positive feedbacks in a competition among technologies that all perform a similar function the presence of increasing returns to adoptions can force all but one technology from the market furthermore the victor need not be the superior technology this paper provides an empirical study of one technological competition which illuminates this theoretical work it uses theoretical results to explain why chemical control of agricultural pests remains the dominant technology in spite of many claims that it is inferior to its main competitor integrated pest management copyright 1996 by royal economic society

intergenerational mobility and marital sorting we use data from the german socio economic panel and the british household panel survey to estimate the extent of intergenerational economic mobility in a framework that highlights the role played by assortative mating we find that assortative mating plays an important role on average about 40 50 of the covariance between parents and own permanent family income can be attributed to the person to whom one is married this effect is driven by strong spouse correlations in human capital which are larger in germany than britain 2006 the authors journal compilation royal economic society 2006

the disposition effect in securities trading an experimental analysis the disposition effect is the tendency to sell assets that have gained value winners and keep assets that have lost value losers disposition effects can be explained by the two features of prospect theory the idea that people value gains and losses relative to a reference point the initial purchase price of shares and the tendency to seek risk when faced with possible losses and avoid risk when a certain gain is possible our experiments were designed to see if subjects would exhibit disposition effects subjects bought and sold shares in six risky assets asset prices fluctuated in each period contrary to bayesian optimization subjects did tend to sell winners and keep losers when the shares were automatically sold after each period the disposition effect was greatly reduced

hysteresis price acceptance and reference prices the existence of price thresholds in grocery retailing is well documented most authors explain the existence of price thresholds using assimilation contrast theory adaptation level theory or prospect theory however each of these theories is untenable if consumers are believed to behave rationally we offer a theoretical explanation grounded in real options theory rot and economic hysteresis we test the rot hypothesis against three plausible alternatives using a maximum likelihood friction model that we augment for unobserved heterogeneity our findings support the rot hypothesis and suggest that the existence of price thresholds in aggregate data are driven by a common recognition of real option values which do not disappear with the inclusion of consumer heterogeneity

intergenerational top income mobility in sweden capitalist dynasties in the land of equal opportunity this paper presents new evidence on intergenerational mobility at the top of the income and earnings distributions using a large dataset of matched father son pairs in sweden we find that intergenerational transmission is very strong at the top more so for income than for earnings at the extreme top top 0 1 income transmission is remarkable with an intergenerational elasticity of approximately 0 9 we also study potential transmission mechanisms and find that iq non cognitive skills and education of the sons are all unlikely channels in explaining the strong transmission within the top percentile increases in the income of the fathers if they are related at all are negatively associated with these variables wealth on the other hand has a significantly positive association our results suggest that sweden known for having relatively high intergenerational mobility in general is a society in which transmission remains strong at the very top of the distribution and wealth is the most likely channel

firm organizational heterogeneity and market structure evidence from the japanese pesticide market abstract this paper empirically investigates the effects of the organizational forms of firms on their entry behaviors and market structure to exploit the exogenous variation in firm organizational forms we use japanese pesticide market data first our empirical analysis shows that a model of imperfect competition fits the japanese pesticide market well despite the existence of regulations we then estimate the effect of organizational heterogeneity on entry behavior firms having capital ties with special distribution networks tend to enter this market more readily than do firms without such ties furthermore diversified and vertically nonintegrated firms are more likely to enter this market than are stand alone and vertically integrated firms these findings suggest that markets with distribution related diversified and vertically nonintegrated potential entrants are more competitive than those with the same number of potential entrants that have no such characteristics

impact of bt cotton on pesticide poisoning in smallholder agriculture a panel data analysis while substantial research on the productivity and profit effects of bt cotton has been carried out recently the economic evaluation of positive and negative externalities has received much less attention here we focus on farmer health impacts resulting from bt related changes in chemical pesticide use previous studies have documented that bt cotton has reduced the problem of pesticide poisoning in developing countries but they have failed to account for unobserved heterogeneity between technology adopters and non adopters we use unique panel survey data from india to estimate unbiased effects and their developments over time bt cotton has reduced pesticide applications by 50 with the largest reductions of 70 occurring in the most toxic types of chemicals results of fixed effects poisson models confirm that bt has notably reduced the incidence of acute pesticide poisoning among cotton growers these effects have become more pronounced with increasing technology adoption rates bt cotton now helps to avoid several million cases of pesticide poisoning in india every year which also entails sizeable health cost savings