forecasting model of rss3 price in futures market 3 abstract the agricultural futures market affects the rubber price in thailand rubber processors use the agricultural futures market to avoid risks associated with fluctuations in rubber price investors make profits from the difference between the current price and the future price this paper presents the forecasting models for futures price of the natural rubber ribbed smoked sheets no 3 rss3 the results from the most efficient model can inform the decision of investors on buying and selling at the proper time the study employs the least mean squared error as a criterion for the selection of the best prediction model it includes an analysis of factors affecting the rss3 futures prices in thailand s futures market the results show that the previous monthly futures prices and oil prices significantly affected the futures prices in the same direction the net import of natural rubber by japan was the leading indicator for the trend in rubber futures prices in thailand the analytical model was shown to be applicable and would facilitate related studies in forecasting the futures prices of other commodities time series data was found to be suitable for the forecasting model keywords futures price forecasting agricultural futures market

limitation of liability and the ownership structure of the firm this paper models the optimal choice of shareholder liability if investors want managers to be monitored the monitors should be residual claimants shareholders and monitoring and firm value will increase as shareholders commit more of their wealth to the firm when liquidating wealth is costly contingent liability dominates direct investment as a wealth commitment device however if wealth is unobservable under this regime only relatively poor investors will hold shares in equilibrium this may be prevented at a cost by verifying shareholder wealth and restricting stock transfers comparative statics on various liability regimes are used to motivate actual contractual arrangements

an empirical investigation of the effects of rounding on the spf probabilities of decline and output growth histograms i consider the possibility that respondents to the survey of professional forecasters round their probability forecasts of the event that real output will decline in the future as well as their reported output growth probability distributions i make various plausible assumptions about respondents rounding practices and show how these impinge upon the apparent mismatch between probability forecasts of a decline in output and the probabilities of this event implied by the annual output growth histograms i find that rounding accounts for about a quarter of the inconsistent pairs of forecasts

what went wrong the erosion of relative earnings and employment among young black men in the 1980s this paper shows a widening in black white earnings and employment gaps among young men from the mid 1970s through the 1980s earnings gaps increased most among college graduates and in the midwest while gaps in employment population rates grew most among dropouts we attribute the differential widening to shifts in demand for subgroups due to shifting industry and regional employment the falling real minimum wage and deunionization the growing supply of black to white workers that was marked among college graduates and to increased crime among dropouts the different factors affecting subgroups highlight the economic diversity of black americans

affirmative action and the racial wage gap among the many disturbing changes in the structure of wages in recent years the stagnation in the male racial wage gap may be the most disheartening race remains america s oldest and most persistent cause of social and economic disparity but many of us had been encouraged by the steady and significant economic progress since the second world war the recent stagnation challenges that optimism in this paper i attempt to identify the reasons why the wage stagnation took place many americans particularly those in the media and political arena believe they already know the reason according to them this stagnation is the predictable consequence of the affirmative action policies associated with the reagan administration one reason why many believe that the reagan era deserves principal responsibility for the racial stagnation is the belief that equal employment opportunity commission eeoc resources were gutted during this period eeoc inflation adjusted budgets grew almost 15 percent per year during the 1970 s while there was some slowdown in the last half of the decade constantdollar eeoc budgets expanded by 7 2 percent per year during the carter administration and almost 1 400 budgeted positions were added to the eeoc a growth of 50 percent between 1976 and 1980 there is no question that the reagan era witnessed an abrupt end to the growth in resources that would have taken place eeoc constant dollar budgets actually fell during this period and the number of positions declined by almost one thousand and as eeoc resources and personnel fell during the 1980 s so did the measurable outputs the sharp break in the 1980 s was not so much in the aggregate level of activity but in its composition and the resources available per case spurred by the passage of the age discrimination act in 1979 age came into its own during this decade starting with only 14 cases in the year after passage of the act the number of age cases rose at an astonishing pace to over 30 000 by 1992 even without this explosion in age related charges the significance of race was declining while the number of race charges increased by 10 percent after 1980 sex charges were expanding by 40 percent by 1992 only 40 percent of all cases involved race issues compared to 85 percent of all charges in 1970 and 61 percent in 1980 the declining importance of race in the eeoc s agenda reflects a more general dilution of race as the core civil rights labormarket concern since 1965 the road to equal rights has become very crowded the quest for racial justice was the clear moral force behind the civil rights act with women added in an unsuccessful attempt to scuttle the legislation subsequently hispanics have begun to rival blacks in their political clout and protected minority group status was extended to men over 40 those with a disability and gays the end result is that more than three quarters of today s labor force enjoy protected minority group status blacks are now a minority within the protected minority class which itself represents the majority

racial discrimination in the labor market theory and empirics we review theories of race discrimination in the labor market taste based models can generate wage and unemployment duration differentials when combined with either random or directed search even when strong prejudice is not widespread but no existing model explains the unemployment rate differential models of statistical discrimination based on differential observability of productivity across races can explain the pattern and magnitudes of wage differentials but do not address employment and unemployment at their current state of development models of statistical discrimination based on rational stereotypes have little empirical content it is plausible that models combining elements of the search models with statistical discrimination could fit the data we suggest possible avenues to be pursued and comment briefly on the implication of existing theory for public policy jel j15 j31 j64 j71

foreign owned insurer performance in the us property liability markets foreign owned property liability insurers have increased their market share in the us in the recent decades they may have achieved this by being more efficient by undercutting prices to attract away business from their domestic rivals or both we investigate return risk efficiency and determinants of efficiency performance of these insurers relative to their domestic competitors we find that these firms are less profitable and less efficient in terms of cost scale and revenue x efficiencies but more efficient in terms of cost x and revenue scale efficiencies overall the evidence shows that both of the aforementioned factors have contributed to their growth

evaluating interval forecasts a complete theory for evaluating interval forecasts has not been worked out to date most of the literature implicitly assumes homoskedastic errors even when this is clearly violated and proceed by merely testing for correct unconditional coverage consequently i set out to build a consistent framework for conditional interval forecast evaluation which is crucial when higher order moment dynamics are present the new methodology is demonstrated in an application to the exchange rate forecasting procedures advocated in risk management

explanations of the inconsistencies in survey respondents forecasts a comparison of the point forecasts and the probability distributions of inflation and output growth made by individual respondents to the us survey of professional forecasters indicates that the two sets of forecasts are sometimes inconsistent we evaluate a number of possible explanations and find that not all forecasters update their histogram forecasts as new information arrives this is supported by the finding that the point forecasts are more accurate than the histograms in terms of first moment prediction c 2009 elsevier b v all rights reserved

the basic analytics of moral hazard the basic analytics of moral hazard are developed using the simplest possible model of the insurance market even when the underlying expected utility function and the function relating the accident probability to accident prevention effort are extremely well behaved the indifference curves and feasibility set the set of insurance contracts which at least break even are not indifference curves need not be convex and feasibility sets never are priceand income consumption lines may be discontinuous and effort is not in general a monotonic or continuous function of the parameters of the insurance policies provided

a theory of mutual formation and moral hazard with evidence from the history of the insurance industry nonprofit mutually owned insurance and banking organizations have significant market shares in the insurance and banking industries a first step in a systematic study of these financial mutual is to examine the reasons for their formation doing so provides empirical support for the view that these mutual arose as an efficient means of addressing contracting challenges caused by aggregate uncertainties and moral hazard a formal model with this property is presented we argue that information asymmetries do more to explain the kinds of contracts offered by financial mutual than do agency problems between owners managers and customers article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

toward a positive economic theory of hedging the hedging models developed over the last half century are evaluated for their ability to explain the actual hedging behavior of the various economic agents this evaluation shows a total lack of a reasonable positive model of hedging behavior while each class of existing models predicts some observed behavior none is able to predict the broad range of actions that is easily observed in the real world in this paper i develop such a model and include a plausible and coldly rational economic explanation for why farmers don t hedge at all while merchandisers with identical risk attitudes will fully hedge

the liability insurance market t his paper offers an overview of the u s liability insurance market and the link between its performance and developments in tort law over the last few decades the dominant feature of the insurance market has been the intermittent periods of rapidly rising premiums and cutbacks on the availability of coverage the insurance cycle appears to be increasing in amplitude and since the 1960s has been concentrated increasingly in liability lines an episode of rising premiums in the late 1960s was followed by a six year period of declining and eventually negative growth rates in total liability insurance premiums over the 1975 1977 period the annual growth rate jumped to 30 percent then followed another period of declining real premiums until premiums nearly tripled in 1984 1986 accompanied by cancellations of policies and massive withdrawal of insurers from some lines this crisis had an economic impact beyond the insurance market leading to the withdrawal of many goods and services from u s markets in mid 1987 the market began to turn again with premiums falling by as much as 40 percent for some commercial policies since then aggregate revenue from premiums has been relatively stable the liability insurance market is intertwined with the tort system in addition to providing incentives to avoid accidents the tort system allocates the risks of accident costs in providing compensation for accident victims the modern expansion of liability in tort law as described by priest in this issue represents a shift in the burden of supplying insurance from first party insurance markets to liability or third party insurance markets clearly this shift will

predicting u s business cycle regimes this article examines the use of logistic classification methods for the identification and prediction of postwar u s business cycle expansion and contraction regimes as defined by the national bureau of economic research nber reference turning point dates we present a coherent theoretical framework for this task using measures of discriminatory information the analysis encompasses model selection parameter estimation and classification decision rules we examine the performance of logistic procedures in reproducing the nber regime classifications and in predicting one and three months ahead using leading indicator variables our models are shown to provide substantially more accurate business cycle regime predictions than markov switching specifications

forecasting efficiency concepts and applications this article introduces the concept of forecast efficiency in which the forecast contains all information available at the time of the forecast empirical tests investigate weak efficiency where the information set is all past forecasts and where all forecast revisions and errors should be uncorrelated with past forecast revisions tests of macroeconomic energy consumption and oil price forecasts find a significant autocorrelation of forecast revisions with fifty of fifty one tests showing positive correlation of forecast revisions as opposed to zero correlation consistent with forecast efficiency copyright 1987 by mit press

unemployment equilibria and input prices theory and evidence from the united states the paper develops an efficiency wage model where input prices affect the equlibrium rate of unemployment we show that a simple framework based on only two prices the real price of oil and the real rate of interest is able to explain the main post war movements in the rate of u s joblessnss the equations do well in forecasting unemployment many out of sample and provide evidence that the oil price spike associated with iraq s invasion of kuweit appears to be a component of the mystery recession which followed

the dynamics of the volatility skew a kalman filter approach abstract much attention has been devoted to understanding and modeling the dynamics of implied volatility curves and surfaces this is crucial for both trading pricing and risk management of option positions we suggest a simple yet flexible model based on a discrete and linear kalman filter updating of the volatility skew from a risk management perspective we assess whether this model is capable of producing good density forecasts of daily returns on a number of option portfolios we also compare our model to the sticky delta and the vega gamma alternatives we find that it clearly outperforms both alternatives given its ability to easily account for movements of different nature in the volatility curve

forecast encompassing tests and probability forecasts we consider tests of forecast encompassing for probability forecasts for both quadratic and logarithmic scoring rules we propose test statistics for the null of forecast encompassing present the limiting distributions of the test statistics and investigate the impact of estimating the forecasting models parameters on these distributions the small sample performance is investigated in terms of small numbers of forecasts and model estimation sample sizes we show the usefulness of the tests for the evaluation of recession probability forecasts from logit models with different leading indicators as explanatory variables and for evaluating survey based probability forecasts copyright c 2010 john wiley sons ltd

oil and the macroeconomy since world war ii all but one of the u s recessions since world war ii have been preceded typically with a lag of around three fourths of a year by a dramatic increase in the price of crude petroleum this does not mean that oil shocks caused these recessions evidence is presented however that even over the period 1948 72 this correlation is statistically significant and nonspurious supporting the proposition that oil shocks were a contributing factor in at least some of the u s recessions prior to 1972 by extension energy price increases may account for much of post opec macroeconomic performance

unequal pay or unequal employment a cross country analysis of gender gaps we analyze gender wage gaps correcting for sample selection induced by nonemployment we recover wages for the nonemployed using alternative imputation techniques simply requiring assumptions on the position of imputed wages with respect to the median we obtain higher median wage gaps on imputed rather than actual wage distributions for several oecd countries however this difference is small in the united states the united kingdom and most central and northern eu countries and becomes sizable in southern eu countries where gender employment gaps are high selection correction explains nearly half of the observed negative correlation between wage and employment gaps

does implied volatility provide any information beyond that captured in model based volatility forecasts this paper contributes to our understanding of the informational content of implied volatility here we examine whether the s p 500 implied volatility index vix contains any information relevant to future volatility beyond that available from model based volatility forecasts it is argued that this approach differs from the traditional forecast encompassing approach used in earlier studies the findings indicate that the vix index does not contain any such additional information relevant for forecasting volatility

male white black wage gaps 1979 1994 a distributional analysis 1 introductionnumerous studies show that during the 1980s the mean white black wage gap among new entrant 0 10 years of potential experience males expanded 1 juhn murphy and pierce 1991 jmp attribute the mean gap s expansion to a widening of the overall u s wage distribution caused by a host of economy wide race neutral changes that led to labor demand shifts toward better educated and better skilled workers regardless of race because african americans tend to be at lower levels of the overall skill distribution the shifts adversely impacted african american men more than white men leading to an expansion in the mean wage gap to arrive at this conclusion jmp decompose the expansion in the mean new entrant wage gap into four components the first two components measure the wage gap s increase because of a widening in observable racial differences in measured characteristics and their prices for example educational attainment and the returns to education the third component captures the contribution of growing racial discrimination and widening differences in unmeasured skills to the wage gap s expansion this term s contribution is measured by the drop in the mean percentile rank of blacks in the white residual wage distribution the fourth component identifies the role of increases in the prices of unmeasured skills and is measured by the increase in the variance of the white residual wage distribution when applied to the march annual demographic files of the current population survey jmp find that from 1979 to 1987 increases in the price of unmeasured skills explain all of the new entrant mean wage gap s expansion indicating that factors that adversely impacted less skilled workers regardless of race are the primary cause of the wage gap s expansion in related work reardon 1997 uses a national sample of white and african american men from the 1980 and 1990 decennial censuses and shows that the mean racial wage gap s expansion is caused by increased variance in the distribution of residual wages generated by labor demand shifts toward high skilled whites and away from medium skilled whites and high skilled african american men the wage gap expands because high skilled african american men earn wages that are similar to those of whites in the middle and upper third of their wage distribution the labor demand shifts led to a stretching or increased variance in the wage distribution that favored high skilled whites relative to high skilled african americans and medium skilled whites this paper makes several contributions to the literature on racial wage gaps and the technical literature on wage decompositions first i examine whether jmp s 1991 results hold up when the analysis is disaggregated by experience and educational attainment this is an important extension for two reasons bound and freeman 1992 rodgers 1997a and others have found that the racial wage gap among high school graduates and particularly among college graduates expanded significantly after the late 1970s over the same time period the variance of wages within these educational categories increased second it is important to determine the extent to which racial inequality that was generated while a cohort was a new entrant persists as it ages the paper s technical innovation is the development of a distribution or skill specific decomposition that identifies whether the stretching of the white wage distribution uniformly contributes to an expansion in racial inequality at all skill levels or quantiles of the wage distribution or whether the contribution of the wage distribution s stretching is specific to a skill level for example does the increase in the price of unmeasured skills explain a greater portion of the increase in the racial wage gap between high skilled african americans and whites than it does between medium skilled african americans and whites

predicting u s recessions financial variables as leading indicators this paper examines the out of sample performance of various financial variables as predictors of u s recessions series such as interest rates and spreads stock prices and monetary aggregates are evaluated individually and in comparison with other financial and nonfinancial indicators the analysis focuses on out of sample performance from one to eight quarters ahead results show that stock prices are useful with one to three quarter horizons as are some well known macroeconomic indicators beyond one quarter however the slope of the yield curve emerges as the clear individual choice and typically performs better by itself out of sample than in conjunction with other variables

regulation capital and the evolution of organizational form in us life insurance this paper studies the association between regulation and the organizational form of new life insurers between 1900 and 1949 the mutual form was popular in states with low initial capital requirements for mutual companies and differentially higher requirements for stock companies but was rarely used elsewhere this suggests that entrepreneurs took a path of least resistance when choosing organizational form and that the mutual s disadvantage in raising capital contributed to its decline a decline that accelerated as states raised requirements and eliminated the aforementioned differentials contrary to previous analysis the paper finds little evidence connecting other regulations to mutual decline jel g21 l51 n21 n22

gender wage inequality during sri lanka s post reform growth a distributional analysis abstract this paper investigates gender wage inequality in sri lanka during 1992 2014 a period of robust economic growth following pro market reforms the gap in mean wages between men and women decreased steadily over this period unconditional quantile regression reveals the decline in gender wage inequality was driven by the upper half of the distribution and was due to improvements in women s observable human capital yet the pay structure became more unequal indicating widening gender gaps in the returns to labor market characteristics and in unobservable determinants of wages the gender gap in pay structure widened disproportionately in the lower half of the distribution coinciding with falling absolute and relative returns to women in manufacturing industries and production occupations facing greater international competition the study also demonstrates selection bias underestimates the gender wage gap and overestimates the gains in equality over time factors that hinder gender equality in the labor market are discussed along with policy implications

the relation between implied and realized volatility abstract previous research finds the volatility implied by s p 100 index option prices to be a biased and inefficient forecast of future volatility and to contain little or no incremental information beyond that in past realized volatility in contrast we find that implied volatility outperforms past volatility in forecasting future volatility and even subsumes the information content of past volatility in some of our specifications our results differ from previous studies because we use longer time series and nonoverlapping data a regime shift around the october 1987 crash explains why implied volatility is more biased in previous work

forecasting stock return variance toward an understanding of stochastic implied volatilities we examine the behavior of measured variances from the options market and the underlying stock market under the joint hypotheses that markets are informationally efficient and that option prices are explained by a particular asset pricing model forecasts from time series models of the stockreturn process should not have predictive content given the market forecast as embodied in option prices both in sample and out of sample tests suggest that this hypothesis can be rejected using simulations we show that biases inherent in the procedure we use to imply variances cannot explain this result thus we provide evidence inconsistent with the orthogonality restrictions of option pricing models that assume that variance risk is unpriced these results also have implicationsfor optimal variance forecast rules

evidence on features of a dsge business cycle model from bayesian model averaging the empirical support for features of a dynamic stochastic general equilibrium model with two technology shocks is evaluated using bayesian model averaging over vector autoregressions the model features include equilibria restrictions on long run responses a structural break of unknown date and a range of lags and deterministic processes we find support for a number of features implied by the economic model and the evidence suggests a break in the entire model structure around 1984 after which technology shocks appear to account for all stochastic trends business cycle volatility seems more due to investment specific technology shocks than neutral technology shocks

predicting volatility in the foreign exchange market measures of volatility implied in option prices are widely believed to be the best available volatility forecasts in this article we examine the information content and predictive power of implied standard deviations isds derived from chicago mercantile exchange options on foreign currency futures the article finds that statistical time series models even when given the advantage of ex post parameter estimates are outperformed by isds isds however also appear to be biased volatility forecasts using simulations to investigate the robustness of these results the article finds that measurement errors and statistical problems can substantially distort inferences even accounting for these however isds appear to be too variable relative to future volatility it is widely believed that the volatility implied in option prices is the market s best estimate of future volatility after all if it were not one could devise a trading strategy that could generate profits by identifying mispriced options the purpose of this article is to investigate the information content and predictive power of volatility implied in options on foreign currencies the paper focuses on options on currency futures traded on the chicago mercantile exchange cme because of the depth and liquidity of cme futures and options traded side by side in the same market implied standard deviations isds allow for clean tests of the predictive power of implied volatilities early studies of the information content of isds have generally found that these contain substantial information for future volatility latane and rendleman 1976 chiras and manaster 1978 and beckers 1981 for example regress future volatility on the weighted implied volatility across a broad sample of chicago board options exchange cboe stocks and find that options contain volatility forecasts that are more accurate than historical measures 1 these studies performed shortly after the 1973 beginning of the cboe option market could only use a relatively short time span and therefore focused on cross sections rather than time series predictions

real time forecasting regional tourism with business sentiment surveys abstract this study provides evidence that supply side soft information retrieved from business surveys is effective in real time forecasting of hotel arrivals at the regional level we assess the effect of including business sentiment indicators in commonly used naive specifications and structural time series models using residuals and predictive diagnostics we find that both the goodness of fit and the forecasting accuracy of the augmented models are superior to those of the baseline models whence the opportunity to extend to the tourism sector the surveys on the business sentiment currently realized by the provincial chambers of commerce for the manufacturing sector allowing an effective and timely managing of local tourism market where official information is likely to be either lacking or poor in quality

the employment of black men trends in wages and employment of black men are contradictory wages are rising and employment is falling the article first describes employment trends using data from the five decennial censuses 1940 80 noting that education is becoming a more important determinant of participation next it is shown that ratios of average wages have not been severely biased by falling participation of those who would earn the least if they worked the final question asks whether falling participation of black men results from deteriorating job opportunities or from falling labor supply falling supply appears to dominate

a distributional analysis of the gender wage gap in bangladesh this article empirically investigates the gender wage gap in bangladesh during the period 2005 2009 applying unconditional quantile regression models the article demonstrates that women are paid less than men throughout the wage distribution and the gap is higher at the lower end of the distribution discrimination against women is the primary determinant of the wage gap the article also demonstrates that the observed gender wage gap is likely to be underestimated if we ignore selection in full time employment a number of policy implications are discussed

wages and participation during the last 25 years annual hours worked by prime aged men fell by the equivalent of six 40 hour workweeks the reduction was more pronounced among those younger than among mid age workers among black men than among white men and among those with less schooling thus hours worked not only fell but showed increased dispersion increases that paralleled the growth in wage dispersion that has become so familiar to students of trends in wages the argument advanced here is that the correspondence is not coincidental the changes in hours worked are simply the labor supply responses that follow the changes in the structure of wages

evaluating density forecasts with applications to financial risk management density forecasting is increasingly more important and commonplace for example in financial risk management yet little attention has been given to the evaluation of density forecasts the authors develop a simple and operational framework for density forecast evaluation they illustrate the framework with a detailed application to density forecasting of asset returns in environments with time varying volatility finally the authors discuss several extensions copyright 1998 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

what happened to the oil price macroeconomy relationship abstract strong evidence is found that oil prices no longer granger cause many u s macroeconomic indicator variables in data after 1973 a number of potential explanations are explored that sample stability issues are responsible that oil prices are now endogenous and that linear and symmetric specifications misrepresent the form of the oil price interaction none of these hypotheses are supported by the data the opec price increases do appear to have had significant impacts while the effects of the price declines of the 1980s are smaller and harder to characterize these results have potentially important implications for the large body of research which utilizes oil prices as an instrumental or explanatory variable

this is what happened to the oil price macroeconomy relationship abstract many of the quarterly oil price increases observed since 1985 are corrections to even bigger oil price decreases the previous quarter when one looks at the net increase in oil prices over the year recent data are consistent with the historical correlation between oil shocks and recessions

news good or bad and its impact on volatility predictions over multiple horizons we examine whether the sign and magnitude of intra daily returns have impact on expected volatility the next day or over longer future horizons we first let the data speak namely with minimal interference we capture the mapping between intra daily returns and future volatility we revisit the concept of news impact curves introduced by engle and ng 1993 overall we find that moderately good intra daily news reduces volatility the next day while both very good news unusual high intra daily positive returns and bad news negative returns increase volatility with the latter having a more severe impact the asymmetries disappear over longer horizons we also introduce a new class of parametric models which feature asymmetries and with close ties to arch type models albeit applicable to a mixture of high and low frequency data models featuring asymmetries dominate especially during the 2007 2008 financial crisis

adverse selection aggregate uncertainty and the role for mutual insurance companies a model of insurance markets analogous to that of rothschild and stiglitz 1976 is considered with the additional feature that risk neutral insurers face aggregate undiversifiable risk in the presence of adverse selection and aggregate uncertainty and under a simple nondegeneracy condition on loss probabilities the authors show that any equilibrium has the feature that some agents purchase participating policies from mutual insurers while others purchase nonparticipating policies and hence do not share risk with their insurer specifically agents with low loss probabilities signal their type by sharing aggregate risks with their insurer some empirical support for this prediction is provided copyright 1990 by the university of chicago

pareto optima and competitive equilibria with adverse selection and moral hazard this paper explores the extent to which standard general equilibrium analysis of pareto optima and of competitive equilibria can be applied to environments with moral hazard and adverse selection problems allowing for lotteries contracts with random components we first establish that an adverse selection insurance economy a moral hazard insurance economy a signaling economy and a private information labor market economy are all special cases of a simple general structure we then show that techniques for characterizing pareto optimal contracts as solutions to concave programming problems are useful and nice and appear to be broadly applicable allowing for lotteries we show how to characterize the optimal allocations for the adverse selection insurance and labor market economies we then show that standard existence and optimality theorems for competitive equilibria apply in the linear space containing lotteries if agents with characteristics which are distinct and privately observed at the time of initial trading enter the economy wide resource constraints in a homogeneous way other kinds of diversity are not critical for economies with moral hazard which satisfy the homogeneity condition competitive contract markets single out a subset of the optima and thus can be consistent with apparent unemployment and with a random allocation of labor supplied though all households are averse to risk the adverse selection insurance and signaling economies however do not satisfy the homogeneity condition and are difficult to decentralize efficiently with a price system

forecasting currency volatility a comparison of implied volatilities and ar fi ma models we compare forecasts of the realized volatility of the pound mark and yen exchange rates against the dollar calculated from intraday rates over horizons ranging from one day to three months our forecasts are obtained from a short memory arma model a long memory arfima model a garch model and option implied volatilities we find intraday rates provide the most accurate forecasts for the one day and one week forecast horizons while implied volatilities are at least as accurate as the historical forecasts for the one month and three month horizons the superior accuracy of the historical forecasts relative to implied volatilities comes from the use of high frequency returns and not from a long memory specification we find significant incremental information in historical forecasts beyond the implied volatility information for forecast horizons up to one week

black white earnings ratios since the civil rights act of 1964 the importance of labor market dropouts published median earnings of wage and salary workers by race and sex are based on distributions that exclude those without earnings and those not employed as wage and salary workers at the time of the survey it has been argued that the changing importance of these exclusions rather than any improvement in the distribution of offered wages for blacks accounts for the apparent increase in black white relative median earnings this paper presents a new method for correcting the published medians for such censoring the apparent improvement in relative earnings is reduced but not eliminated by the correction

multivariate forecasting of a commodity portfolio application to cattle feeding margins and risk traditionally economists have utilized univariate approaches to forecast prices even for firms operating in multicommodity environments this research improves the way in which managerial decision making is analysed by developing a model better representing the price risks and opportunities faced by firms that produce using a portfolio of commodities using the situation of cattle feedlot investors and managers as an example this is accomplished by recognizing the multivariate live cattle feeder cattle and corn prices situation that feedlots operate in and employing corresponding multivariate simulation techniques evaluation suggests that properly modelling the cattle feeding margin as a multivariate set of prices significantly improves the accuracy of forecasting future feeding margin values realized in the cash market the model also suggests incorporating both implied and historical time varying volatility information when forecasting margin variability implications for other multicommodity sit

a re examination of the predictability of economic activity using the yield spread this paper revisits the yield spread s usefulness for predicting future real gdp growth we show that the contribution of the spread can be decomposed into the effect of expected future changes in short rates and the effect of the term premium we find that both factors are relevant for predicting real gdp growth but the respective contributions differ we investigate whether the cyclical behavior of interest rate volatility could account for either or both effects we find that while volatility displays important correlations with both the term structure of interest rates and gdp it does not appear to account for the yield spread s usefulness for predicting gdp growth

labor market dropouts and trends in the wages of black and white men there is continuing debate over whether and to what degree estimations of black white wage convergence are biased because they leave labor market dropouts out of the picture if a high proportion of blacks become discouraged and cease searching for jobs and if those dropouts have on average poor job prospects the average wage of black workers who remain in the labor market will be an upwardly biased estimate of the average wage across the population this paper introduces a simple method of imputing wages to non workers when non workers are accounted for in the calculations real wage growth for prime age black men over the 1969 98 period is reduced approximately 40 and black white wage convergence is reduced by approximately one third the author finds that a source of bias as important as falling employment rates is the growing gap between wages of workers and potential wages of non workers

evaluating information in multiple horizon forecasts the doe s energy price forecasts abstract the united states department of energy s doe quarterly price forecasts for energy commodities are examined to determine the incremental information provided at the one through four quarter forecast horizons a direct test for determining information content at alternative forecast horizons developed by vuchelen and gutierrez vuchelen j and gutierrez m i a direct test of the information content of the oecd growth forecasts international journal of forecasting 21 2005 103 117 is used the results suggest that the doe s price forecasts for crude oil gasoline and diesel fuel do indeed provide incremental information out to three quarters ahead while natural gas and electricity forecasts are informative out to the four quarter horizon in contrast the doe s coal price forecasts at two three and four quarters ahead provide no incremental information beyond that provided for the one quarter horizon recommendations of how to use these results for making forecast adjustments is also provided

black men s relative earnings are the gains illusory this study investigates the hypothesis that the increase in the median earnings of black men relative to those of white men after 1964 in the united states largely reflects the labor force withdrawal of high proportions of low wage black men who availed themselves of government transfers analyzing current population survey and social security administration data through 1985 the author finds little empirical support for three direct implications of the sample censoring hypothesis of the total measured gain in relative earnings between 1964 and 1985 from 531 to 663 or 13 2 percentage points he finds that only 14 or 1 8 percentage points can be attributed to sample selection

stock versus mutual ownership structures the risk implications this article provides empirical tests of the risk differences between two types of ownership structure in the property liability insurance industry empirical evidence is provided that suggests stock insurers have more risk than mutuals where the risk inherent in future cash flows is proxied by the variance of the loss ratio further evidence suggests that stock insurers write relatively more business than do mutuals in lines and states having higher risk copyright 1993 by university of chicago press

school quality and black white relative earnings a direct assessment the wage differential between black and white men fell from 40 percent in 1960 to 25 percent in 1980 it has been argued that this convergence reflects improvements in the relative quality of black schools to test this hypothesis we assembled data on pupil teacher ratios annual teacher pay and term length for black and white schools in the eighteen segregated states from 1915 to 1966 these data are linked to estimated returns to education for southern born men from different cohorts and states in 1960 1970 and 1980 improvements in the relative quality of black schools explain 20 percent of the narrowing of the black white earnings gap between 1960 and 1980

forecasting stock market volatility and information content of implied volatility index abstractthis study investigates the incremental information content of implied volatility index relative to the garch family models in forecasting volatility of the three asia pacific stock markets

the modern expansion of tort liability its sources its effects and its reform this paper reviews the development of tort law during the 20th century with particular attention to the broad expansion of liability since the 1970s it attempts to explain the origins of the expansion of liability to present examples of its effects on product and service markets and to analyze the extensive efforts of the past five to six years toward liability reform efforts which i conclude have had only a slight relationship to the underlying sources of modern liability problems though the empirical evidence is thin virtually all studies of the effects of specific modern rules demonstrate that modern tort law has substantially dislocated product and service markets as one might expect of an assertive legal regime founded on largely noneconomic principles as we shall see market dislocations especially for insurance have increased sharply during the past decade

forecast encompassing as the necessary condition to reject futures market efficiency fluid milk futures the traditional necessary condition for futures market inefficiency is the existence of alternative forecasting methods that produce mean squared forecast errors smaller than the futures market here a more exacting requirement for futures market efficiency is proposed forecast encompassing using the procedure of harvey and newbold multiple forecast encompassing is tested using chicago mercantile exchange fluid milk futures time series models and usda experts provide competing forecasts results suggest milk futures do not encompass the information contained in the usda forecasts at a two quarter horizon while the competing forecasts generate positive revenues it is unlikely that returns exceed transaction costs in this relatively new market

news and noise in g 7 gdp announcements revisions to gdp announcements are known to be quite large in all g 7 countries quarterly growth rate revisions are regularly more than a full percentage point at an annualized rate we examine the predictability of these revisions using standard statistical tests of whether the preliminary announcement is a rational forecast of the subsequently revised data previous work suggests that u s gdp revisions are largely unpredictable as would be the case if the revisions reflect news not available at the time that the preliminary number is produced we find that the degree of predictability varies throughout the g 7 although we find little predictability in u s revisions the data revisions for several foreign countries are highly predictable we also perform a simple real time forecasting exercise showing that for several countries the predictability of data revision could be used to generate improved preliminary data

tests for multiple forecast encompassing in the evaluation of economic forecasts it is frequently the case that comparisons are made between a number of competing predictors a natural question to ask in such contexts is whether one forecast encompasses its competitors in the sense that they contain no useful information not present in the superior forecast we develop tests for this notion of multiple forecast encompassing which are robust to properties expected in the forecast errors and apply the tests to forecasts of uk growth and inflation copyright 2000 john wiley sons ltd

caviar conditional autoregressive value at risk by regression quantiles value at risk var has become the standard measure of market risk employed by financial institutions for both internal and regulatory purposes var is defined as the value that a portfolio will lose with a given probability over a certain time horizon usually one or ten days despite its conceptual simplicity its measurement is a very challenging statistical problem and none of the methodologies developed so far give satisfactory solutions interpreting the var as the quantile of future portfolio values conditional on current information we propose a new approach to quantile estimation which does not require any of the extreme assumptions invoked by existing methodologies such as normality or i i d returns the conditional autoregressive value at risk or caviar model moves the focus of attention from the distribution of returns directly to the behavior of the quantile we specify the evolution of the quantile over time using a special type of autoregressive process and use the regression quantile framework introduced by koenker and bassett to determine the unknown parameters since the objective function is not differentiable we use a differential evolutionary genetic algorithm for the numerical optimization utilizing the criterion that each period the probability of exceeding the var must be independent of all the past information we introduce a new test of model adequacy the dynamic quantile test applications to simulated and real data provide empirical support to this methodology and illustrate the ability of these algorithms to adapt to new risk environments

oil and the macroeconomy when prices go up and down an extension of hamilton s results in an important paper hamilton 1983 demonstrated a strong correlation between oil price changes and gross national product growth in u s data however his study pertained to a period in which all the large oil price movements were upward and thus it left unanswered the question whether the correlation persists in periods of price decline moreover the price variable he used was somewhat distorted by price controls in the 1970s this note investigates whether hamilton s results continue to hold when the sample is extended to include the recent oil market collapse and the oil price variable is corrected for the effects of price controls particular attention is given to the possibility of asymmetric responses to oil price increases and decreases as suggested in the structural employment literature loungani 1986 davis 1987 hamilton 1988 like hamilton i based my investigation on the gnp equation in sims s 1 980b six variable quarterly vector autoregressive model

the federal deposit insurance fund that didn t put a bite on u s tax payers abstract unlike the federal savings and loan insurance corporation and the bank insurance fund the national credit union share insurance fund ncusif survived the 1980s without falling into a state of accounting insolvency this paper analyzes how differences in incentive structure constrain the attractiveness of interest rate speculation and other risk taking opportunities to managers and regulators of credit unions despite these better incentives robust present value calculations establish that ncusif fell into economic insolvency during the mid 1980s besides calculating the extent of this insolvency the paper also seeks to explain why after ncusif became insolvent it could rebuild its reserves without an explicit or implicit taxpayer bailout our explanation turns on cross industry coinsurance responsibilities and the shallowness of the fund s observed insolvency relative to industry net worth we identify forces in the decisionmaking environment tending to limit the depth and duration of unresolved insolvencies at individual credit unions managerial opportunities to benefit personally from taking risks that would flow through to ncusif are constrained by difficulties in converting a credit union to stockholder form and by the intensity of proactive monitoring of troubled credit unions by sister institutions and other private coinsurers we conjecture that expanded use of coinsurance and private monitoring could reduce taxpayer loss exposure elsewhere in government deposit insurance systems