robust portfolio optimization with derivative insurance guarantees robust portfolio optimization aims to maximize the worst case portfolio return given that the asset returns are allowed to vary within a prescribed uncertainty set if the uncertainty set is not too large the resulting portfolio performs well under normal market conditions however its performance may substantially degrade in the presence of market crashes that is if the asset returns materialize far outside of the uncertainty set we propose a novel robust optimization model for designing portfolios that include european style options this model trades off weak and strong guarantees on the worst case portfolio return the weak guarantee applies as long as the asset returns are realized within the prescribed uncertainty set while the strong guarantee applies for all possible asset returns the resulting model constitutes a convex second order cone program which is amenable to efficient numerical solution procedures we evaluate the model using simulated and empirical backtests and analyze the impact of the insurance guarantees on the portfolio performance

pricing and hedging in incomplete markets with model uncertainty abstract we search for a trading strategy and the associated robust price of unhedgeable assets in incomplete markets under the acknowledgement of model uncertainty our set up is that we postulate the management of a firm that wants to maximise the expected surplus by choosing an optimal investment strategy furthermore we assume that the firm is concerned about model misspecification this robust optimal control problem under model uncertainty leads to i risk neutral pricing for the traded risky assets and ii adjusting the drift of the nontraded risk drivers in a conservative direction the direction depends on the firm s long or short position and the adjustment that ensures a robust strategy leads to what is known as actuarial or prudential pricing our results extend to a multivariate setting we prove existence and uniqueness of the robust price in an incomplete market via the link between the semilinear partial differential equation and backward stochastic differential equations for viscosity and classical solutions

institutional determinants of labor reallocation in transition the transition process differed in the countries of the former soviet union fsu and those of central and eastern europe cee in terms of reallocation of labor real wage employment and output adjustment we sift through the theoretical and empirical literature to find an explanation for these diverging adjustment trajectories and conclude that they can be explained by the fact that the cee countries adopted social policies that upheld wages at the bottom of the distribution forcing the old sector to restructure or collapse while the fsu countries allowed wages to free fall not forcing the hand of the old sector

competition in political and economic markets do anomalies play an important role in explaining economic and political choices are political decisions more prone to anomalies irrationality and inefficiency than economic decisions in their integration of results derived from experimental psychology and applied political economy frey and eichenberger 1990 argue that social scientists ought to answer these questions in the affirmative after examining a large body of choice data frey and eichenberger conclude that individuals deviate from the axioms of rational choice in their view the resultant anomalies in individual behavior are unaffected by the aggregation which occurs in the economic marketplace they conclude that political decision making systems correct no larger a proportion of these anomalies than are corrected by the economic market in many institutional settings outlined in their paper decision making systems can be expected to magnify individuals deviations from rational behavior system wide irrational behavior will then produce less frequent trading and a less efficient allocation of resources in this note we examine two components of frey and eichenberger s argument first we reconsider their evidence for irrational behavior in light of a larger body of experimental data which includes choices made in market settings second we argue that competition in political markets will tend to eliminate aggregate anomalies just as it does in economic markets experimental economists often generate data which distinguish between choices individuals indicate in unstructured environments and transactions individuals consummate in markets initial statements regarding choices are often inconsistent with subsequent trading behavior these data indicate that the economist s maximization paradigm based on tenets of rational choice is

collective agreements wages and firms cohorts evidence from central europe using a large matched employer employee data set the authors investigate the impact of company and industry collective bargaining agreements on wages in the czech republic hungary and poland ce3 they also examine the changing characteristics of the union wage premium in different cohorts of establishments their results challenge the common idea of weak unions in the ce3 by revealing a union wage premium whose characteristics depend on the level at which collective bargaining occurs they find that industry agreements increase wages for low skilled workers while company agreements increase medium and high skilled wages their second finding is that the union wage premium is unevenly distributed between cohorts with substantial cross country variation wage premiums are concentrated in the transitional cohorts in the czech republic and poland and to a lesser extent in the pre transitional cohort in hungary

an analysis of life satisfaction in albania an heteroscedastic ordered probit model approach this paper uses the nationally representative albanian living standards measurement study survey from 2005 to investigate the determinants of life satisfaction in common with much of the existing empirical literature that models life satisfaction or subjective well being this paper exploits an ordered probit model in contrast to the existing literature however the current study places an important emphasis on regression model evaluation diagnostic testing revealed a number of econometric model deficiencies but the explicit incorporation of a variance function into the ordered probit model resolved all detected problems the tenor of the key findings generally reflects that found in the literature on the determinants of life satisfaction for both advanced capitalist and transitional economies however a number of additional themes with a strong albanian dimension were interrogated in particular our study revealed evidence of long memories among albanian respondents with respect to the collapse of that country s notorious pyramid schemes and the scarring effects of the episode continue to impact on life satisfaction even with the passage of almost eight years a sizeable effect for communal level criminal activity on life satisfaction was also detected in addition our econometric estimates also provided some empirical insights on the monetary value of friendship and the costs of children

the disparity between willingness to accept and willingness to pay measures of value psychologists have long argued that people are much more averse to a loss than attracted to an equivalent gain this behavior termed loss aversion has been formalized by kahneman and tversky 1979 in their reformulation of expected utility theory prospect theory in prospect theory the utility function is replaced by a value function that evaluates changes in income from the current level increases in income are weighted by a relatively small marginal utility decreases in income are weighted by a much larger marginal utility in effect the value function implies that a kink in the relationship between utility and income occurs at the initial income or reference point and that the slope of the utility function for losses in income is steeper than it is for gains in a recent paper knetsch and sinden 1984 report a series of experiments that demonstrate the existence of a large disparity between willingness to accept wta and willingness to pay wtp measures of value they argue that the psychological theory of loss aversion explains this difference economic theory would suggest that individuals who exhibit a large disparity between wta and wtp are perhaps underperceiving the value of gains or overperceiving the value of losses are behaving in an irrational manner and will consequently achieve a lower level of well being than if they behaved in a true utility maximizing manner this would in contrast to loss aversion usually imply near equal values for wta and wtp see willig 1976 further documentation of a larger than expected disparity between wta and wtp has been obtained in surveys asking for the value of a variety of public goods for example cummings brookshire and schulze 1986 document six

why democracies produce efficient results by applying the standard tools of microeconomic analysis i argue that democratic markets work as well as economic markets in particular i show that previous work has greatly exaggerated the existence of principal agent and informational problems in electoral markets and has drawn incorrect conclusions

does political reform increase wealth or why the difference between the chicago and virginia schools is really an elasticity question this paper shows that contrary to becker work there is no innate tendency for political competition to reduce the total cost of government wealth transfers simple examples demonstrate how the effects of government policies on total wealth boil down to the elasticities of the marginal support and opposition curves disagreements between the chicago and virginia schools of political economy can be understood as a disagreement about these elasticities the broader implications for this argument in terms of the efficiency of the common law are also discussed

can socioeconomic heritage produce a lost generation with regard to entrepreneurship a considerable amount of literature deals with the influence of institutions on entrepreneurship but for all that little is known about the interplay between institutions and personal determinants of entrepreneurship in this paper the empirical evidence that older people in transition economies have low engagement in entrepreneurial activity is the starting point for analyzing how institutions moderate the relationship between individual characteristics and entrepreneurial choice the results show that the socioeconomic heritage of being exposed to socialism deters entrepreneurship an effect that is more pronounced for high impact entrepreneurship detailed analyses reveal that the effect is driven by devaluation of socialist work experience and the influence of socialism on mindset

capture and ideology in the economic theory of politics the economic theory of regulation long ago put public interest theories of politics to rest these theories have correctly been viewed as normative wishings rather than explanations of real world phenomena they have been replaced by models of political behavior that are consistent with the rest of microeconomics anthony downs 1957 james buchanan and gordon tullock 1965 george stigler 1971 sam peltzman 1976 recently however debate has arisen over whether some version of a public interest theory of regulation will have to be readmitted to our thinking about actions and results in the political arena what is at issue is the empirical importance of the altruistic publicly interested goals of rational actors in determining legislative and regulatory outcomes james kau and paul rubin 1979 kalt 1981 peltzman 1982 this study assesses the nature and significance of publicly interested objectives in a particular instance of economic policymaking u s senate voting on coal strip mining regulations the existence of such objectives is of course no contradiction of the economic view of human behavior kenneth arrow 1972 gary becker 1974 and may well be rooted in genetic biological history becker 1976 jack hirshleifer 1978 generally however individuals altruistic publicly interested goals have been given little attention this reflects the judgment that such goals are so empirically unimportant as to allow the use of occam s razor in positive models or well founded apprehensions that these goals are unusually difficult to identify measure and analyze notwithstanding the latter problem we find that approaches which confine themselves to a view of political actors as narrowly egocentric maximizers explain and predict legislative outcomes poorly the tracking and dissecting of the determinants of voting on coal strip mining policy suggest that the economic theory of politics has been prematurely closed to a broader conception of political behavior

fear unemployment and migration we examine the impact on the uk economy of the flow of workers from ten east european countries after their accession to the european union we find evidence that those most susceptible to competition from these workers have seen weaker wage inflation we document that the presence of these foreign workers has increased the fear of unemployment and helped to contain wage pressure we argue that this inflow of workers has increased supply by more than it has raised demand and thus had the effect of reducing both inflationary pressures and the natural rate of unemployment the recent rise in migration to the uk from eight eu accession countries the czech republic estonia hungary latvia lithuania poland slovakia and slovenia the a8 countries which started in 2004 as well as subsequently from romania and bulgaria the a2 in 2007 has generated a good deal of controversy we will refer to these countries collectively as the a10 henceforth 1 how many of these eastern europeans are there currently in the uk which countries did they come from and when what impact has their influx had on the uk economy and what likely impacts will they have in the future

recipient preferences and the design of government transfer programs most work on the marginal tax rates of government transfer programs has focused on their effect on labor supply it is commonly argued that taxpayers prefer low tax rates because they encourage work effort but dislike low tax rates because they raise the break even point and thereby dilute the ability of a given amount of spending to fight poverty no formal model has been worked out to predict how the tax rate will be set in the face of this trade off

robust portfolio selection using linear matrix inequalities abstract in this paper we consider the problem of robust optimal portfolio selection for tracking error when the expected returns of the risky and risk free assets as well as the covariance matrix of the risky assets are not exactly known we assume that these parameters belong to a convex polytope defined by some known elements which form the vertices of this polytope we consider two problems the first one is to find a portfolio of minimum worst case volatility of the tracking error with guaranteed fixed minimum target expected performance the second one is to find a portfolio of maximum worst case target expected performance with guaranteed fixed maximum volatility of the tracking error we show that these two problems are equivalent to solving linear matrix inequalities lmi optimization problems so that the powerful numerical packages nowadays available for this class of problems can be used a numerical example in the sao paulo stock exchange bovespa is presented

bayes stein estimation for portfolio analysis in portfolio analysis uncertainty about parameter values leads to suboptimal portfolio choices the resulting loss in the investor s utility is a function of the particular estimator chosen for expected returns so this is a problem of simultaneous estimation of normal means under a well specified loss function in this situation as stein has shown the clas sical sample mean is inadmissible this paper presents a simple empirical bayes estimator that should outperform the sample mean in the context of a portfolio simulation analysis shows that these bayes stein estimators provide significant gains in portfolio selection problems

good bye lenin or not the effect of communism on people s preferences preferences for redistribution as well as the generosities of welfare states differ significantly across countries in this paper we test whether there exists a feedback process of the economic regime on individual preferences we exploit the experiment of german separation and reunification to establish exogeneity of the economic system from 1945 to 1990 east germans lived under a communist regime with heavy state intervention and extensive redistribution we find that after german reunification east germans are more in favor of redistribution and state intervention than west germans even after controlling for economic incentives this effect is especially strong for older cohorts who lived under communism for a longer time period we further find that east germans preferences converge towards those of west germans we calculate that it will take one to two generations for preferences to converge completely

migration for degrading work as an escape from humiliation this paper develops a model of voluntary migration into degrading work the essence of the model is a tension between two bads that which arises from being relatively deprived at home and that which arises from engaging in humiliating work away from home balancing between these two bads can give rise to an explicit voluntary choice to engage in humiliating work the paper identifies conditions under which a migrant will choose to engage in degrading work rather than being forced into it to work abroad as a prostitute say rather than on a farm the paper delineates the possible equilibria and finds that greater relative deprivation will make it more likely that the equilibrium outcome will be engagement in prostitution it is shown that under well specified conditions every individual will work as a prostitute yet every individual would be better off working on a farm put differently when specific conditions are satisfied there is a possibility of a coordination failure if individuals believe that everyone else will choose to be a prostitute this belief will be self fulfilling in this case all the individuals choose to engage in prostitution which renders each of them worse off the paper discusses various policy implications it is shown that a policy intervention a crackdown on migrants engagement in prostitution if implemented strictly can increase everyone s welfare but when the policy is implemented loosely cracking down on prostitution will only reduce individuals welfare without reducing their engagement in prostitution

causes of u s farm commodity programs this paper i s an attempt to explain variations by commodity in producer protection afforded by farm price support programs since the1930s particularly emphasized are theideas that these programs are essentially income redistributional measures and that given political forces the programs are attempts to redistribute efficiently variables associated with the cost to producers of generating political pressure and the social cost deadweight losses of redistribution are both found to be empirically important copyright 1987 by university of chicago press

model misspecification and underdiversification in this paper we study intertemporal portfolio choice when an investor accounts explicitly for model misspecification we develop a framework that allows for ambiguity about not just the joint distribution of returns for all stocks in the portfolio but also for different levels of ambiguity for the marginal distribution of returns for any subset of these stocks we find that when the overall ambiguity about the joint distribution of returns is high then small differences in ambiguity for the marginal return distribution will result in a portfolio that is significantly underdiversified relative to the standard mean variance portfolio

robust min max portfolio strategies for rival forecast and risk scenarios we consider an extension of the markowitz mean variance optimization framework to multiple return and risk scenarios it is well known that asset return forecasts and risk estimates are inherently inaccurate the method proposed provides a means for considering rival representations of the future the optimal portfolio is computed simultaneously with the worst case to take account of all rival scenarios this is a min max strategy which is essentially equivalent to a robust pooling of the scenarios robustness is ensured by the noninferiority of min max for example a basic worst case optimal return is guaranteed in view of multiple return scenarios if robustness happens to have too high a cost guided by the min max pooling it is also possible to explore other pooling alternatives a min max algorithm is used to solve the problem and illustrate the robust character of min max with return and risk scenarios we study the properties of the min max risk return frontier and compare with the potentially suboptimal worst case where the investment strategy and the worst case are computed separately 2000 elsevier science b v all rights reserved jel classixcation c44 c61 c63 g11

shadows of the past the effect of communist heritage on employee consultation following research on transition economies in central and eastern europe cee and having been motivated by arguments pertaining to the business systems approach the authors propose that the existence of a communist heritage decreases the likelihood that employees will be consulted during organizational change processes results based on 23 876 firms across 27 of the european union eu 27 countries support this proposition moreover the likelihood of direct consultation decreases with the existence of formal employee representation and an increasing share of foreign ownership in firms located in cee countries the authors discuss these findings in the context of organizational democracy research and the recent literature on transition economies and contribute to a more comprehensive understanding of participative decision making processes in organizations

environmental regulation whose self interests are being protected special interest can explain why environmental policy limits economic activity in areas where air quality is above minumum standards locational competition among region helped create a policy that raised factor mobility cost from slower to faster growing regions analysis of votes shows greater support for this policy was received from northern urban constituencies and the greatest opposition came from the south and the west pollution abatement costs per unit of output are higher in areas with higher not lower air quality

the textile bill of 1985 the determinants of congressional voting patterns the following tables show the results of the probit analysis for the senate and the house a table including results for different combinations of the independent variables is included in an unpublished appendix available from the authors upon request the results of the probit analysis for the senate are shown in table 1 all the variables except exp had the expected signs however the results indicate that the two other employment variables and party affiliation are the only factors which we can say with confidence influenced a senator s decision to vote for or against this bill the coefficients reported and labeled der of prob measure the derivative of the probability of a yes vote evaluated at the means of the independent variables in question thus for example the coefficient for unemp in the top line of table 1 should be interpreted as indicating that a one percentage point increase in a state s unemployment rate will cause a 5 89 increase in the probability that the senator will vote for the bill the result for dr the party of the senator shows that in general democrats are more apt to vote for protectionist policies than are republicans this is consistant with president reagan s negative stand on the bill and his threat to veto it should it pass the amendment in question passed the senate on 24 october 1985 by a vote of 54 for to 42 against but the bill it was attached to has been postponed indefinitely the house bill which was passed on 10 october 1985 by a vote of 262 for to 159 against was vetoed by reagan on 17 december 1985 the results of the probit analysis for the house of representatives are shown in table 2 state employment data was used for the house as opposed to data for each voting district this was done for three reasons first employment data is usually reported by state or by county since counties are often divided by congressional district boundaries much personal judgement would be necessary to assign employment figures second the most recent county industry employment data is from 1981 while the data used in this analysis is from 1984 third we feel that in general logrolling is prevalent among a state s representatives for this bill the representatives from twenty six states voted as a block and in all but six states one third or less of that state s representatives voted contrary to the majority all of the probabilities are significant at the 05 confidence level representative s voting patterns are influenced by all of the included factors when unionization is added to the equation its coefficient is very small and negative although it is significant at the 05 confidence level one would expect more significance here since there are more degrees of freedom for the house analysis than for that of the senate when the data from the house and senate are pooled the results are similar to those of the house alone the null hypothesis that the data cannot be pooled was tested using a statistic with eight degrees of freedom 9 721 meaning that the null hypothesis is rejected as in the senate the state unemployment rate and the percent employed in textiles are important influences on the representative s vote and democrats in the house are more likely to vote for protectionist bills than republicans however unlike the senate the percent of a representative s campaign contributions that are donated by industry special interest groups has a significant effect on voting patterns although the point estimates for the magnitudes of the influence are very similar in both cases seventy four percent of the house received campaign contributions from these special interest groups while only 54 of the senate received contributions from these same sources this is probably because only one third of the senate was up for reelection during the time period considered while the entire house was in the process of campaigning for reelection exports also play a role in influencing the probability of a yes vote reducing this probability as employment in export industries increases but the magnitude of the coefficient is only 11 of that for textile employment the significance of this variable in the house is probably due to fear of retaliation expressed by both democrats and republicans this variable was not significant in the senate model most likely because the senate version excluded from the 1 import quota growth rate many countries who might have retaliated representatives appear to respond to a wider variety of constituent interests than do senators while senators voting patterns are only significantly influenced by their political affiliation their state s unemployment rate and the importance of textiles to their state the voting behavior of representatives is influenced by these factors as well as the importance of exports to their state and campaign contributions by textile special interest groups these results affirm the validity of the approach used by baldwin and coughlin they differ from baldwin who finds exports are not a significant influence on the house and from coughlin who does not include export employment as an explanitory variable or analyze the differences in voting patterns between the house and the senate

popular attitudes toward free markets the soviet union and the united states compared random samples of the moscow and new york populations were compared in their attitudes towards free markets by administering identical telephone interviews in the two countries in may 1990 although the soviet respondents were somewhat less likely to accept exchange of money as a solution to personal problems and although their attitudes toward business were less warm the authors found that the soviet and american respondents were basically similar in some very important dimensions in their attitudes toward fairness income inequality and incentives and in their understanding of the working of markets copyright 1991 by american economic association

the attitudinal legacy of communist labor relations this study of workers attitudes compares data from international social survey programme issp surveys for former communist countries in europe with issp data for western countries over the perio

robust one period option hedging we consider robust optimization to cope with uncertainty about the stock return process in one period option hedging problems the robust approach relates portfolio choice to uncertainty making more cautious hedges when uncertainty is high we represent uncertainty by a set of plausible expected returns of the underlying stocks and show that for this set the robust problem is a second order cone program that can be solved efficiently we apply the approach to find an optimal portfolio to hedge an index option

empowerment effects across cultures three studies examined cross cultural variations in empowerment effects study 1 investigated whether hofstede s power distance scores moderated the effect of job autonomy on job satisfaction using world values survey data on 33 nations study 2 surveyed frontline hotel employees from canada and prc to investigate the moderating role of power distance at the individual level in study 3 hotel management students from canada and prc were asked to play the role of a frontline employee who had to handle a special customer request in a scenario experiment these studies show consistently that the cultural value of power distance moderates the effect of empowerment on job satisfaction moreover willingness to accept and exercise the discretionary power allowed by management and desire to satisfy customer needs and wants are two employee conditions that are essential for the successful implementation of the empowerment approach