the role of american depositary receipts in the development of emerging equity markets this paper finds that the growth and expansion of u s cross listings by firms from emerging markets around the world facilitated an expansion of cross border equity flows and overall development of their stock markets during the 1990s however these benefits have negative spillover effects the capitalization and turnover ratios of local market firms that do not pursue overseas listings decline as u s cross listings in the form of american depositary receipts adrs increase in size and scope we investigate various possible sources of these negative spillovers and offer new evidence that the growth of adrs neither facilitates nor hinders local market development but represent an outcome of poorly functioning local markets policy implications are discussed

commodity price volatility and world market integration since 1700 abstract poor countries are more volatile than rich countries and this volatility impedes their growth furthermore commodity prices are a key source of that volatility this paper explores price volatility since 1700 to offer three stylized facts commodity price volatility has not increased over time commodities have always shown greater price volatility than manufactures and world market integration breeds less commodity price volatility thus economic isolation is associated with much greater commodity price volatility while world market integration is associated with less

on the co movement between coffee and cocoa prices in international markets in this article we study the movement between cocoa and coffee prices two close substitute commodities using the ardl approach developed by pesaran et al 2001 we found that the two prices are cointegrated the long run elasticity of coffee price with respect to the cocoa one is estimated at 0 88 also using the lag augmented var approach of toda and yamamoto 1995 which is valid whatever the order of integration of the data the cocoa price is found to granger cause the coffee price and not vice versa this finding suggests that models aiming at forecasting coffee prices should incorporate cocoa prices as well

unemployment insurance and subsequent job duration job matching versus unobserved heterogeneity the relationship between unemployment insurance ui benefit duration unemployment duration and subsequent job duration is investigated using a multi state duration model with state specific unobserved heterogeneity i examine two potential explanations for the negative correlation between unemployment and job spell durations ui benefits increase job matching quality the matching effect versus unobserved heterogeneity adverse selection the matching effect is found to be weak although new jobs accepted within 5 weeks of benefit termination seem to have a higher dissolution rate the negative correlation between unemployment and job duration is mostly explained by unobserved heterogeneity various simulations indicate that increasing the maximum benefit duration by one week will raise expected unemployment duration by 1 0 to 1 5 days but will raise expected job duration by 0 5 to 0 8 day only copyright 2001 john wiley sons ltd

trying to explain home bias in equities and consumption investors hold a substantially larger proportion of their wealth portfolios in domestic assets than standard portfolio theory would suggest a phenomenon called equity home bias in the absence of this bias investors would optimally diversify domestic output risk using foreign equities therefore consumption growth rates would tend to co move across countries even when output growth rates do not empirically however consumption growth rates tend to have a lower correlation across countries than do output growth rates a phenomenon i call consumption home bias in this paper i discuss these two biases and their potential relationship as suggested by the literature

risk taking global diversification and growth this paper develops a continuous time stochastic model in which international risk sharing can yield substantial welfare gains through its effect on expected consumption growth the mechanism linking global diversification to growth is an attendant world portfolio shift from safe low yield capital to riskier high yield capital the presence of these two types of capital captures the idea that growth depends on the availability of an ever increasing array of specialized hence inherently risky production inputs calibration exercises using consumption and stock market data imply that most countries reap large steady state welfare gains from global financial integration copyright 1994 by american economic association

international risk sharing with endogenously segmented asset markets abstract asset price data imply a large degree of international risk sharing while aggregate consumption data do not we show that a model with trade in goods and endogenously segmented asset markets can account for this puzzling discrepancy active households who pay a fixed cost to transfer money into or out of assets share risk within and across countries and their marginal utility growth prices assets so asset prices imply high risk sharing inactive households consume their current income and do not share risk so aggregate consumption which averages across all households reflects lower risk sharing the model also provides a resolution to the backus smith kollmann puzzle

interest rates and currency prices in a two country world abstract this paper is a theoretical study of the determination of prices interest rates and currency exchange rates set in an infinitely lived two country world which is subject both to stochastic endowment shocks and to monetary instability formulas are obtained for pricing all equity claims nominally denominated bonds and currencies and these formulas are related to earlier closely related results in the theories of money finance international trade

dynamics of oil price precious metal prices and the exchange rate in the long run abstract we examine the relationship between the oil price prices of precious metals gold silver and platinum and the us dollar british pound exchange rate using parametric and non parametric modelling over a 135 year period for the parametric model we employ a two regime threshold vector error correction model tvecm and find non linearity and asymmetries in the long term relationship between the oil gold price and oil silver price pairs during the typical regime in which the majority of observations lie non linear granger causality suggests evidence of bidirectional and unidirectional causality for the non parametric model we employ local linear ll non parametric regression to relax the assumptions regarding functional form the relationship between the oil price and each of the precious metal prices and the exchange rate exhibit non linearities the relationship between precious metal prices and the oil price is positive and generally increasing over time while the ll estimates for the exchange rate are negative and then positive and highly non linear

bivariate garch estimation of the optimal commodity futures hedge six different commodities are examined using daily data over two futures contract periods cash and futures prices for all six commodities are found to be well described as martingales with near integrated garch innovations bivariate garch models of cash and futures prices are estimated for the same six commodities the optimal hedge ratio ohr is then calculated as a ratio of the conditional covariance between cash and futures to the conditional variance of futures the estimated ohrs reveal that the standard assumption of a time invariant ohr is inappropriate for each commodity the estimated ohr path appears non stationary which has important implications for hedging strategies

the role of copulas in the housing crisis abstract due to its simplicity and familiarity the gaussian copula is popular in calculating risk in collaterized debt obligations but it imposes asymptotic independence such that extreme events appear to be unrelated this restriction might be innocuous in normal times but during extreme events such as the housing crisis the gaussian copula might be inappropriate this paper explores various copula specifications and finds that the degree to which housing prices are related based on the gaussian copula is too small compared with real housing price data

the long term effects of job search requirements evidence from the uk jsa reform this paper investigates long term returns from unemployment compensation exploiting variation from the uk jsa reform of 1996 which implied a major increase in job search requirements for eligibility and in the related administrative hurdle search theory predicts that such changes should raise the proportion of non claimant nonemployed with consequences on search effort and labor market attachment and lower the reservation wage of the unemployed with negative effects on post unemployment wages i test these ideas on longitudinal data from social security records llmdb using a difference in differences approach i find that individuals who start an unemployment spell soon after jsa introduction as opposed to six months earlier are 2 5 3 more likely to move from unemployment into incapacity benefits spells and 4 5 less likely to have positive earnings in the following year this latter employment effect only vanishes four years after the initial unemployment shock also annual earnings for the treated individuals are lower than for the non treated these results suggest that while tighter search requirements were successful in moving individuals off unemployment benefits they were not successful in moving them onto long lasting or better jobs with fairly long lasting unintended consequences on a number of labor market outcomes

pooling risk among countries suppose that international sharing risk worldwide or with large numbers of countries were costly how much risk sharing could be gained in small sets or pools of countries to answer this question we compute the means and variances of poolwide gross domestic product growth for all possible pools of any size drawn from a sample of 74 countries and compare them with the means and variances of consumption growth in each country individually from the difference we infer potential diversification and welfare gains as much as two thirds of the first best full worldwide welfare gains can be obtained in groupings of as few as seven countries the largest potential gains arise from pools consisting of countries in different regions and including countries with weak institutions we argue that international risk sharing fails to emerge because the largest potential gains are among countries that do not trust each other s willingness and ability to abide by international contractual obligations

why do stocks and consumption imply such different gains from international risk sharing abstract estimates of the gains to international risk sharing based upon stock returns tend to find dramatically higher gains than do estimates from consumption based models in this paper i examine the reasons for these differences using a common theoretical framework for both approaches i find that the differences are largely due to the much higher variability of stock returns and its implied intertemporal substitution in marginal utility also contrary to conventional wisdom the differences in gains from the two approaches do not arise from treating stock returns as exogenous rather than endogenous

metal volatility in presence of oil and interest rate shocks abstract this study uses three two factor volatility models of the garch family to examine the volatility behavior of three strategic commodities gold silver and copper in the presence of crude oil and interest rate shocks the results of the standard garch models suggest that gold and silver have almost the same volatility persistence which is greater than that of copper the cgarch estimates indicate that the short run transitory component of volatility converges to zero much faster for copper than for gold and silver in this sequence however the permanent volatility component demonstrates equally strong persistence in the long run for all three metals the egarch results suggest that the leverage effect is present and significant for copper only implying that gold and silver can be good investment in anticipation of bad times past oil shock does not impact all three metals similarly monetary policy and to leaser extent the oil shocks have calming effects on precious metals but not on copper if the t bill rate is used crises such as the 2003 iraq war heighten metal volatility these results have implications for derivatives valuations using gold as a reserve asset risk analysis and for the commodity exporting countries and commodity producing firms

unemployment insurance and unemployment over time an analysis with event history data using event history data this paper analyzes the distribution of reemployment spell durations conditional on the completed length of the preceding contiguous spell of unemployment the model is used to infer how unemployment insurance through unemployment duration may affect the likelihood of reentering unemployment special attention is paid to the endogeneity between unemployment and reemployment duration and the sample information contained in the fact that some individuals obtain reemployment by recall as opposed to acceptance of a new job copyright 1995 by mit press

unemployment insurance and male unemployment duration in canada a model of unemployment duration is estimated with weekly micro data on canadian men entitlement provisions in the unemployment insurance program and demand conditions are found to have a significant effect on the probability of leaving unemployment the probability of a worker leaving unemployment declines with the duration of unemployment holding unemployment insurance entitlement constant when entitlement is allowed to vary the probability of leaving first falls and then generally rises with unemployment duration these results are robust with respect to allowing for person specific unobserved heterogeneity and alternative specifications of duration dependence

on the gains from international financial integration abstract are there large unexploited gains from international financial integration why do they remain unexploited this paper shows that when market incompleteness leads foreigners and residents to value firms differently multiple equilibria arise where domestic residents purchase very inefficient domestic firms

commodity trade and international risk sharing how much do financial markets matter abstract this paper evaluates the social gains from international risk sharing in some simple general equilibrium models with output uncertainty a simulation model calibrated to selected moments of u s and japanese data estimates the incremental loss from a ban on international portfolio diversification to be on the order of 0 20 percent of output per year even the theoretical gains from asset trade may disappear under alternative sets of assumptions on preferences and technology the paper argues that the small magnitude of potential trade gains may help explain the apparently inconsistent findings of empirical studies on the degree of international capital mobility

bad investments and missed opportunities postwar capital flows to asia and latin america since 1950 the economies of east asia grew rapidly but received little inter national capital while latin america received considerable international capitaleven as their economies stagnated the literature typically explains the failureof capital to flow to high growth regions as resulting from international capitalmarket imperfections this paper proposes a broader thesis that country specificdistortions such as domestic labor and capital market distortions also impactcapital flows we develop a dsge model of asia latin america and the rest ofthe world that features an open economy business cycle accounting framework tomeasure these domestic and international distortions and to quantify their con tributions to international capital flows we find that domestic distortions havebeen the predominant drivers of international capital flows and that the generalequilibrium effects of these distortions are very large international capital market distortions also matter but less

spurious welfare reversals in international business cycle models several papers have documented spurious welfare reversals incompletemarkets economy produces a higher level of welfare than the completemarkets economy this paper first demonstrates how conventional linearization can generate approximation errors that can result in welfare reversals using a two country production economy we argue that spurious welfare reversals are not only possible but also plausible under reasonable values for model parameters this paper then proposes an approximation method that modifies the conventional linearization by a bias correction this method can be easily implemented and approximates welfare as accurately as a second order perturbation method

the financialization of food commodity equity and cross commodity return co movements rose dramatically after the 2008 financial crisis this development took place following what has been dubbed the financialization of commodity markets

co movement of major energy agricultural and food commodity price returns a time series assessment abstract using monthly data between 1970 and 2013 we provide a comprehensive analysis of the extent of co movement measured by correlation coefficients among the nominal price returns of 11 major energy agricultural and food commodities we study the degree and the time evolution of unconditional and conditional correlations using a uniform spacings estimation and testing approach multivariate dynamic conditional correlation models and a rolling regression procedure we find that 1 the price returns of energy and agricultural commodities are highly correlated 2 the overall level of co movement among commodities increased in recent years especially between energy and agricultural commodities and in particular in the cases of maize and soybean oil which are important inputs in the production of biofuels and 3 the stock market volatility is positively associated with the co movement of price returns across markets especially after 2007

crack spread hedging accounting for time varying volatility spillovers in the energy futures markets crude oil heating oil and unleaded gasoline futures contracts are simultaneously analysed for their effectiveness in reducing price volatility for an energy trader a conceptual model is developed for a trader hedging the crack spread various hedge ratio estimation techniques are compared to a multivariate garch model that directly incorporates the time to maturity effect often found in futures markets modelling of the time variation in hedge ratios via the multivariate garch methodology and thus taking into account volatility spillovers between markets is shown to result in significant reductions in uncertainty even while accounting for trading costs copyright 2002 john wiley sons ltd

does reducing unemployment insurance generosity reduce job match quality abstract this paper analyzes how a change in slovenia s unemployment insurance law affected the quality of jobs workers found after periods of unemployment taking advantage the natural experiment we show through difference in differences estimation results that reducing the potential duration of unemployment benefits had no detectable effect on wages on the probability of securing a permanent rather than a temporary job or on the duration of the post unemployment job

a reexamination of trends in primary commodity prices this paper conducts a reexamination of the prebisch singer hypothesis by employing the unit root test proposed by lee and strazicich 2003 and lee and strazicich 2004 that allow for up to two structural breaks given the higher power of these tests compared to the zivot and andrews 1992 and lumsdaine and papell 1997 tests rejection of the null can be considered as genuine evidence of stationarity the main findings of this paper are that eleven out of twenty four commodity prices are found to be difference stationary implying that shocks to these commodities tend to be permanent in nature the remaining thirteen prices are found to exhibit trend stationary behavior with either one or two structural breaks most of the commodities that do not exhibit difference stationary behavior seem to contain no significant trends there are fewer cases in relation to past studies of commodities that display negative trends thereby weakening the case for the prebisch singer hypothesis

on the comovement of commodity prices we present strong evidence against the excess comovement hypothesis that the prices of commodities move together beyond what can be explained by fundamentals prior studies employ broad macroeconomic indicators to explain common price movements and potentially correlated fundamentals are not controlled for we use inventory and harvest data to fit a partial equilibrium model that more effectively captures the variation in individual prices the model explains the majority of the comovements among commodities with high price correlation and all of the comovements among those with marginal price correlation common movements in supply factors appear to play an important role in the observed comovements in commodity prices

dynamics of oil price precious metal prices and exchange rate this study examines the co movements and information transmission among the spot prices of four precious metals gold silver platinum and palladium oil price and the us dollar euro exchange rate we find evidence of a weak long run equilibrium relationship but strong feedbacks in the short run the spot precious metal markets respond significantly but temporarily to a shock in any of the prices of the other metal prices and the exchange rate furthermore we discover some evidence of market overreactions in the palladium and platinum cases as well as in the exchange rate market in conclusion whether there are overreactions and re adjustments or not investors may diversify at least a portion of the risk away by investing in precious metals oil and the euro policy implications are provided

commodity price comovement and financial speculation the case of cotton recent booms and busts in commodity prices have generated concerns that financial speculation causes excessive commodity price comovement driving prices away from levels implied by supply and demand under rational expectations we develop a structural vector autoregression model of a commodity futures market and use it to explain two recent spikes in cotton prices in doing so we make two contributions to the literature on commodity price dynamics first we estimate the extent to which cotton price booms and busts can be attributed to comovement with other commodities finding such comovement would be necessary but would not be sufficient evidence to establish that broad based financial speculation drives commodity prices second after controlling for aggregate demand and comovement we develop a new method to point identify shocks to precautionary demand for cotton separately from shocks to current supply and demand to do so we use differences in volatility across time implied by the rational expectations competitive storage model we find limited evidence that financial speculation caused cotton prices to spike in 2008 or 2011 we conclude that the 2008 price spike was driven mostly by precautionary demand for cotton and the 2011 spike was caused by a net supply shortfall

dependence risk analysis in energy agricultural and precious metals commodities a pair vine copula approach we apply pair vine copulas specifically the c vine and r vine copulas to examine the conditional multivariate dependence pattern structure and r vine copula based value at risk var to assess fi

labor market effects of unemployment insurance design with the emergence of the great recession unemployment insurance ui is once again at the heart of the policy debate in this paper we review the recent theoretical and empirical evidence on the labor market effects of ui design we also discuss policy issues related to ui design including the structure of benefits the role of liquidity constraints and the pros and cons of a ui system in which the generosity of ui benefits is varying over the business cycle finally we identify potential areas of future research

global oil prices macroeconomic fundamentals and china s commodity sector comovements abstract this paper investigates the common movements of commodity sectors in china as well as the economic underpinnings of the comovements we employ a bayesian dynamic latent factor model to disentangle the common and idiosyncratic sector specific factors of the prices of a group of china s commodity sectors petrochemicals grains energy non ferrous metals oils fats and softs the results indicate that the common factor accounts for a significant portion of the fluctuations of china s commodity sectors providing evidence of the strong commodity sector comovements in china we further use a var model to link the common movements across china s commodity sectors to the underlying determinants including global oil price shocks and domestic macroeconomic fluctuations we find that the global oil price shocks have strong effects on the common movements across commodity sectors in china in addition to its domestic macroeconomic fluctuations at long horizons however at short horizons the common movements across commodity sectors in china respond more strongly to the global oil shocks than to its domestic macroeconomic fluctuations

is there co movement of agricultural commodities futures prices and crude oil even though significant attempts have appeared in literature the current perception of co movement of commodity prices appear inadequate and static in particular we focus on price movements between crude oil futures and a series of agricultural commodities and gold futures a comparative framework is applied to identify changes in relationships through time and various cointegration methodologies and causality tests are employed our results indicate that co movement is a dynamic concept and that some economic and policy development may change the relationship between commodities furthermore we show that biofuel policy buffers the co movement of crude oil and corn futures until the crude oil prices surpass a certain threshold

home bias in open economy financial macroeconomics standard theory would predict that investors hold a well diversified portfolio of equities across the world but despite the process of financial globalization investors still hold a disproportionate share of local equities in their portfolio the equity home bias french and poterba 1991 we review the various explanations of this puzzling phenomenon in the context of recent developments in macroeconomic modelling that have allowed to incorporate sophisticated international portfolio choices in standard two country general equilibrium models we refer to this literature as open economy financial macroeconomics we focus on three broad classes of explanations i hedging motives in frictionless financial markets real exchange rate and non tradable income risk ii asset trade costs in international financial markets such as transaction costs differences in tax treatments between national and foreign assets iii informational frictions and behavioural biases these recent developments raise the need for new portfolio facts beyond the equity home bias and we will present some new evidence on cross border asset holdings across different types of assets equities bonds and bank lending we also present some new micro data on institutional holdings of equity at the fund level these data should inform macroeconomic modelling of the open economy and a growing literature of models of delegated investment

analyzing comovements in housing prices using vine copulas i introduction when housing prices were rapidly appreciating from 1999 to 2006 investment firms created structured securities by combining mortgages from houses located in different parts of the country and then traders bought and sold those securities and also pieces of those securities called tranches in secondary markets the most familiar of those structured securities was the collateralized debt obligation cdo the main appeal of cdos rested in the belief that due to the localized nature of housing markets houses in separate geographic markets would be unlikely to simultaneously experience large decreases in prices credit rating agencies offered support to this thinking by awarding many cdos the highest possible safety rating however it soon became clear that cdos offered less diversified protection than originally thought when starting in 2006 housing prices in different geographic areas even those located far apart simultaneously plummeted in value as a consequence cdos lost much of their value with the global cdo market shrinking from 482 billion globally in 2007 to only 8 billion in 2010 1 in the wake of the housing crisis financial analysts and policy makers have questioned why compared to pre crisis expectations housing prices showed strong correlations across different geographic areas in addition a branch of research has emerged that attempts to identify sources of and quantify magnitudes of housing price comovements apergis and payne 2012 barros gil alana and payne 2012 the popular press quickly assigned blame to the statistical method used to analyze linkages between housing markets the gaussian copula li 2000 notably the march 2009 issue of the technology magazine wired featured an article on the gaussian copula entitled recipe for disaster the formula that killed wall street similar ideas have reached the general public through the works of nassim taleb taleb 2007 the gaussian copula became popular due in part to its link to the familiar multivariate normal distribution but the multivariate normal distribution has asymptotic independence such that events regardless of the strength of their correlation become independent if one pushes far enough into the tails embrechts mcneil and straumann 2002 thus in the midst of the housing crisis which might be thought of as a lower tail event the gaussian copula predicted near independence in price movements across different areas when in fact prices plummeted simultaneously throughout most of the united states but the gaussian copula s link to the normal distribution was not its only appeal perhaps a bigger reason for its popularity was that the gaussian copula much like the related normal distribution readily extends to higher dimensions certainly credit rating agencies were not considering simple bivariate movements between two locations but rather multivariate movements across many locations recent studies argue that alternative specifications especially copulas that depart from normality more accurately reflect correlations in housing price movements during extreme market swings ho huynh and jachochavez 2014 zimmer 2012 however those improved fits have been achieved only in bivariate models that compare housing price movements between two locations it remains an open question whether non gaussian copulas can accurately reflect housing price movements in higher dimensional settings unfortunately copulas other than the gaussian do not readily extend to higher than bivariate dimensions nelsen 2006 105 attempts to develop higher dimensional copulas some of which are discussed below either impose unrealistic restrictions or present difficulties when applied to data as an alternative this article develops multivariate models of housing price comovements based on vine copulas the approach requires marginal distributions which financial analysts should know with some certainty and bivariate copulas which have well understood statistical properties

welfare gains from international risksharing abstract this paper uses consumption data to compute yet unexploited welfare gains that can be achieved through risksharing among twenty oecd countries there is both aggregate national consumption risk and nondiversifiable individual specific risk countries engage in an optimal risksharing arrangement to pool risk associated with the aggregate consumption endowment streams welfare gains are associated with reduced consumption variability and with the international pricing of the consumption streams of individual countries the paper considers the standard vnm time additive preferences as well as nonexpected utility and habit formation preferences large unexploited gains are found under all sets of preferences leading to an international risksharing puzzle

benefit duration unemployment duration and job match quality a regression discontinuity approach summary we use a sharp discontinuity in the maximum duration of benefit entitlement to identify the effect of extended benefit duration on unemployment duration and post unemployment outcomes employment stability and re employment wages we address dynamic selection which may arise even under an initially random assignment to treatment estimating a bivariate discrete time hazard model jointly with a wage equation and correlated unobservables owing to the non stationarity of job search behavior we find heterogeneous effects of extended benefit duration on the re employment hazard and on job match quality our results suggest that the unemployed who find a job close to and after benefit exhaustion experience less stable employment patterns and receive lower re employment wages compared to their counterparts who receive extended benefits and exit unemployment in the same period these results are found to be significant for men but not for women copyright 2012 john wiley sons ltd

financial integration and growth in a risky world abstract we revisit the debate on the benefits of financial integration in a two country neoclassical growth model with aggregate uncertainty the framework accounts simultaneously for gains from a more efficient capital allocation and gains from risk sharing together with their interaction global numerical methods allow for meaningful welfare comparisons gains from integration are quantitatively small even for riskier and capital scarce emerging economies these countries import capital for efficiency reasons before exporting it for self insurance leading to capital flows and growth reversals along the transition this opens the door to richer empirical implications than previously considered in the literature

autoregressive conditional heteroscedasticity in commodity spot prices muth s 1961 rational expectations model of commodity markets implies that inventory carryover creates arch processes in prices the model also indicates that the expected price variance is an explanatory variable in price regressions hypotheses were tested on price data of twenty commodities using a variation of engle et al 1987 arch m technique an arch process was found in storable and not in non storable commodity data as expected however changes in expected price variance have no significant impact on price copyright 2001 john wiley sons ltd

world oil prices precious metal prices and macroeconomy in turkey we examine the long and short run transmissions of information between the world oil price turkish interest rate turkish lira us dollar exchange rate and domestic spot gold and silver price we find that the world oil price has no predictive power of the precious metal prices the interest rate or the exchange rate market in turkey the results also show that the turkish spot precious metals exchange rate and bond markets do not also provide information that would help improve the forecasts of world oil prices in the long run the findings suggest that domestic gold is also considered a safe haven in turkey during devaluation of the turkish lira as it is globally it is interesting to note that there does not seem to be any significant influence of developments in the world oil markets on turkish markets in the short run either however transitory positive initial impacts of innovations in oil prices on gold and silver markets are observed the short run price transmissions between the world oil market and the turkish precious metal markets have implications for policy makers in emerging markets and both local and global investors in the precious metals market and the oil market

evaluating risky consumption paths the role of intertemporal substitutability abstract in dynamic stochastic welfare comparisons a failure clearly to distinguish between risk aversion and intertemporal substitutability can result in misleading assessments of the impact of risk aversion on the welfare costs of consumption risk changes the problem arises in any setting in which uncertainty is propagated over time notably but not exclusively in economies with stochastic consumption trends regardless of the preference setup adopted an increase in risk aversion amplifies the per period costs of risks the weights consumers use to cumulate the per period costs of risks with persistent effects should however depend on intertemporal substitutability as well as on risk aversion under time separable expected utility preferences an increase in the period utility function s curvature therefore alters the welfare effect of risk for reasons that are in part unrelated to risk aversion to illustrate these points i reconsider lucas s estimate of the cost of consumption instability for the postwar united states

commodity market risk from 1995 to 2013 an extreme value theory approach in this article we examine whether extreme risk has increased in the agricultural commodity market during the period 1995 2013 we add to the literature on food price volatility by analysing the tail segment of futures price return distributions food price variability is a concern for governments and regulators worldwide as most nations trade in food high food price variability can contribute to poverty and malnourishment in particular for people in less economically developed economies we find no indications of systematically increasing tail risk for the commodities in our sample analysis of estimated shape parameters of the generalized extreme value distribution further supports the conclusion that there is no general systematic change in the extreme risk associated with these commodity investments

commodity price excess co movement from a historical perspective 1900 2010 abstract pindyck and rotemberg 1990 s excess co movement hypothesis states that commodity prices move together beyond what fundamentals can explain reflecting possibly traders herding or liquidity constraints we test for price excess co movement in 12 commodities 11 non energy ones and oil spanning over a hundred years 1900 2010 to this end we approximate commodity demand supply factors by their apparent consumption we carry out several tests and find some evidence in favor of excess co movement but its nature appears to be time dependent in particular we conclude that excess co movement with oil is generally present particularly in the industrial metal class we also explore the interdependence between portfolio investment decisions and excess co movement for three unrelated assets cotton copper and petroleum based on conditional value at risk cvar optimization we found some correlations between the two when short sales are excluded during 1971 1999 2004 and 2008

world income components measuring and exploiting risk sharing opportunities a method is constructedfor decomposing the variance of changes in incomes in the world into components to indicate the most important risk sharing opportunities among people of the world a constant absolute risk premium carp model an intertemporal general equilibrium model of the world is presented to permit optimal contract design for a contract designer maximizing a social welfare function the optimal contracts maximize the equilibrium world real interest rate securities are defined in terms of eigenvectors of a transformed variance matrix the method is applied using penn world table data on the g 7 countries 1950

flexible parametric estimation of duration and competing risk models in this paper we specify and estimate a flexible parametric proportional hazards model the model specification is flexibly parametric in the sense that the baseline hazard is non parametric while the effect of the covariates takes a particular functional form we also add parametric heterogeneity to the underlying hazard model specification we specify a flexible parametric proportional competing risks model which permits unrestricted correlation among the risks unemployment duration data are then analysed using the flexible parametric duration and competing risks specifications we find an important effect arising from the exhaustion of unemployment insurance and significantly different hazards for the two types of risks new jobs and recalls

patience persistence and welfare costs of incomplete markets in open economies abstract we investigate the welfare implications of alternative financial market structures in a two country endowment economy model we obtain an analytic expression for the expected lifetime utility of the representative household when sovereign bonds are the only internationally traded asset and we compare this welfare level with that obtained under complete asset markets the welfare cost of incomplete markets is negligible if agents are very patient and shocks are not very persistent but this cost is dramatically larger if agents are relatively impatient and shocks are highly persistent for realistic cases in which agents are very patient and shocks are highly persistent the welfare cost of incomplete markets is highly sensitive to the specific values of these parameters

welfare states and the scar effects of unemployment a comparative analysis of the united states and west germany1 the article examines whether through supporting workers search for adequate reemployment the decommodification achieved by welfare state transfers reduces the longer run scar effects of unemployment drawing on employment history data from the survey of income and program participation and the german socio economic panel the analysis establishes positive effects of unemployment benefits on workers post unemployment jobs workers risks of incurring severe earnings losses of experiencing occupational mobility and of entering unstable job arrangements are considerably reduced in both the united states and west germany as workers face constrained choices in labor markets however this institutional protection of workers economic status comes at the economic cost of prolonged unemployment simulation analyses suggest that higher benefit coverage alone might account for up to 20 of the smaller cumulative disadvantages associated with unemployment for german workers

unemployment dynamics among migrants and natives unemployment rates are often higher for migrants than for natives this could result from longer periods of unemployment as well as from shorter periods of employment this paper jointly examines male native migrant differences in the duration of unemployment and subsequent employment using german panel data and bivariate discrete time hazard rate models compared to natives with the same observable and unobservable characteristics unemployed migrants do not flnd less stable positions but they need more time to flnd these jobs the probability of leaving unemployment also varies strongly between ethnicities while flrst and second generation turks are identifled as the major problem group therefore policy should concentrate on the job flnding process of turkish migrants to flght their disadvantages on the labor market

unemployment insurance in europe unemployment duration and subsequent employment stability the disincentive effect of unemployment insurance on unemployment duration has been the focus of the empirical literature the potential effect of unemployment insurance on post unemployment outcomes which may be regarded as beneficial by improving job matching has attracted much less attention this paper provides evidence on the effect of unemployment benefits on unemployment and employment duration in europe using individual data from the european community household panel for eight countries country specific estimates based on multivariate discrete time duration models controlling for observed and unobserved individual heterogeneity suggest that although receiving benefits has an adverse effect in the sense of increasing unemployment duration there is also a positive effect by increasing subsequent employment duration this beneficial effect of unemployment insurance on employment stability is pronounced in countries with relatively generous benefit systems and for recipients who have remained unemployed for at least six months these findings are in line with theories suggesting a matching effect of unemployment insurance

employment dynamics of immigrants versus natives evidence from the boom bust period in spain 2000 2011 this article studies whether the durations in unemployment and employment for immigrants and natives respond differently to changes in economic conditions and to the receipt of unemployment benefits using spanish administrative data for the period 2000 2011 we estimate multi spell duration models that disentangle unobserved heterogeneity from true duration dependence our findings suggest that immigrants are more sensitive to changes in economic conditions both in terms of unemployment and employment hazards the effect of the business cycle is not constant but decreases with duration at a higher rate among immigrants we provide evidence that the higher job separation rates and lower capital labor complementarity of immigrants are mechanisms that are possibly compatible with these results we also find evidence of a disincentive effect of unemployment benefits on unemployment duration which is stronger for immigrants but only at the beginning of the unemployment spell especially under good economic conditions finally unemployment benefits increase job match quality only for native workers with temporary contracts jel j64 j61 c23 c41 j65

firm specific information and the efficiency of investment abstract in the three year period following stock market liberalizations the growth rate of the typical firm s capital stock exceeds its pre liberalization mean by an average of 4 1 percentage points cross sectional changes in investment are significantly correlated with the signals about fundamentals embedded in the stock price changes that occur upon liberalization panel data estimations show that a 10 percentage point increase in a firm s expected future sales growth predicts a 2 9 to 3 5 percentage point increase in the growth rate of its capital stock country specific changes in the cost of capital drive changes in investment but firm specific changes in the cost of capital do not

on the relationship between the prices of oil and the precious metals revisiting with a multivariate regime switching decision tree this study examines the volatility and correlation and their relationships among the euro us dollar exchange rates the s p500 equity indices and the prices of wti crude oil and the precious metals gold silver and platinum over the period 2005 to 2012 our model links the univariate volatilities with the correlations via a hidden stochastic decision tree the ensuing hidden markov decision tree hmdt model is in fact an extension of the hidden markov model hmm introduced by jordan et al 1997 the architecture of this model is the opposite that of the classical deterministic approach based on a binary decision tree and it allows a probabilistic vision of the relationship between univariate volatility and correlation our results are categorized into three groups namely 1 exchange rates and oil 2 s p500 indices and 3 precious metals a switching dynamics is seen to characterize the volatilities while in the case of the correlations the series switch from one regime to another this movement touching a peak during the period of the subprime crisis in the us and again during the days following the tohoku earthquake in japan our findings show that the relationships between volatility and correlation are dependent upon the nature of the series considered sometimes corresponding to those found in econometric studies according to which correlation increases in bear markets at other times differing from them

optimal unemployment insurance this paper considers the design of an optimal unemployment insurance system the problem is modeled as a repeated principalagent problem involving a risk averse agent the unemployed worker and a risk neutral principal which cannot monitor the agent s search effort the optimal long term contract subject to the associated incentive constraints is characterized this contract involves a replacement ratio that decreases throughout the unemployment spell and a wage tax after reemployment that under some mild regularity conditions increases with the lenght of the unemployment spell some numerical results are presented that suggest that the gains from switching to this optimal unemployment insurance scheme could be quite large the performance of this optimal contract is also compared to alternative liquidity provision mechanisms

the impact of unemployment insurance generosity on match quality distribution abstract this paper investigates the impact of unemployment insurance ui generosity on the distribution of match tenure we show that more generous ui increases expected tenure reducing the mass of the lower tail of match duration and increasing the duration of matches available this impact is differentiated across education levels with the larger benefits accruing to the less educated

market interdependence and volatility transmission among major crops this article provides a comprehensive analysis of the dynamics of volatility across major agricultural commodities in the united states volatility interactions across markets may lower the effectiveness of diversification strategies to mitigate price risks and should be taken into account when analyzing the pricing behavior of different agricultural commodities we follow a multivariate garch approach to evaluate the time evolution of conditional correlations and volatility transmission across corn wheat and soybeans price returns on a daily weekly and monthly basis the period of analysis is from 1998 to 2012 the estimation results indicate a lack of lead lag relationships between corn wheat and soybeans price returns at the mean level we find however important volatility spillovers across commodities particularly at the weekly and monthly level wheat and corn seem to play a major role in terms of volatility transmission despite the supposed higher financial market integration of agricultural commodities we do not observe that agricultural markets have become more interdependent in recent years

on the excess co movement of commodity prices a note about the role of fundamental factors in short run dynamics abstract since the influential paper by pindyck and rotemberg 1990 the excess co movement of commodity prices the economic journal 100 1173 1189 there is a common belief that prices of unrelated commodities tend to move together in excess of what can be explained by fundamentals in this paper we consider monthly data of 51 commodities from 1980 to 2008 to confirm that raw resources exhibit co movement at high frequencies nonetheless focusing on oil and six metal prices we present evidence that the high level of correlation between cycles of commodity prices can be explained to a large extent by common shocks to inventory levels once the influences of supply and demand are filtered out it appears that the links between commodity prices are rather loose

the match quality gains from unemployment insurance this paper assesses the benefits of unemployment insurance ui by measuring its effect in match quality we note that ui generosity should affect the decision to match or not and should therefore have some effect on match quality using nlsy data we analyze the relationship between postunemployment job tenure and measures of the state level ui generosity and the unemployment rate at the time the job is started we show that greater ui generosity leads to longer job tenure furthermore we find some evidence that this effect is more pronounced during busts ui having a limited dampening effect on the cyclical variation in match quality

unemployment insurance and unemployment spells this paper tests the effects of the level and length of unemployment insurance benefits on unemployment durations the paper particularly studies individual behavior during the weeks just prior to when benefits lapse higher unemployment insurance benefits are found to have a strong negative effect on the probability of leaving unemployment however the probability of leaving unemployment rises dramatically just prior to when benefits lapse individual data are used with accurate information of spell durations and the level and length of benefits the semiparametric estimation techniques used in the paper yield more plausible estimates than conventional approaches and provide useful diagnostics copyright 1990 by the econometric society

subsidized temporary jobs lock in and stepping stone effects this article evaluates the effectiveness of subsidized temporary jobs as stepping stones to regular employment we study a french program that allows job seekers to work part time while remaining registered with the unemployment agency in this program insured individuals concurrently receive part of their unemployment benefits and wage income using administrative data we find that subsidized temporary jobs have both a significant lock in effect and a significant positive post treatment impact on the hazard rate to employment since individuals facing a high implicit tax rate have incentives to self select into better part time jobs we also find that a higher tax rate leads to a weaker lock in effect and a stronger post treatment effect simulations suggest that the lock in effect first dominates but that the overall effect eventually becomes positive they also point to ways of improving the effectiveness of the policy

grain price and volatility transmission from international to domestic markets in developing countries summary understanding the sources of domestic food price volatility in developing countries and the extent to which it is transmitted from international to domestic markets is critical to help design better global regional and domestic policies to cope with excessive food price volatility and to protect the most vulnerable groups this paper examines short term price and volatility transmission from major grain commodities to 41 domestic food products across 27 countries in africa latin america and south asia we follow a multivariate garch approach to model the dynamics of monthly price return volatility in international and domestic markets the period of analysis is 2000 through 2013 in terms of price transmission we only observe significant interactions from international to domestic markets in few cases to calculate volatility spillovers we simulate a shock equivalent to a 1 increase in the conditional volatility of price returns in the international market and evaluate its effect on the conditional volatility of price returns in the domestic market the transmission of volatility is statistically significant in just one quarter of the maize markets tested more than half of rice markets tested and all wheat markets tested volatility transmission seems to be more common when trade imports or exports are large relatively to domestic requirements

the welfare effect of international asset market integration under nominal rigidities abstract this paper assesses the impact of integrating international asset markets when segmented markets are not the only distortion using a two country general equilibrium model with nominal rigidities and monetary shocks we show that integration is not universally beneficial instead the welfare impact depends on the degree to which exchange rate fluctuations are passed through to consumer prices while the integration is welfare neutral in the polar cases of complete or zero pass through this is not the case when pass through is partial when shocks are equally volatile in both countries integration can be detrimental or beneficial depending on the degree of pass through when shocks are more volatile in one country it benefits from integration compared with the more stable country

the excess co movement of commodity prices reconsidered this paper provides an empirical reconsideration of evidence for excess co movement of commodity prices within the framework of univariate and multivariate garch 1 1 models alternative formulations of zero excess co movement are provided and corresponding score and likelihood ratio tests are developed monthly time series data for two sample periods 1960 85 and 1974 92 on up to nine commodities are used in contrast to earlier work only weak evidence of excess co movement is found

market incompleteness and the equity premium puzzle evidence from state level data abstract this paper investigates the importance of market incompleteness by comparing the rates of risk aversion estimated from complete and incomplete markets environments for the incomplete markets case we use consumption data for the 50 us states we find that the rate of risk aversion under the incomplete markets setup is much lower furthermore including the second and third moments of the cross sectional distribution of consumption growth in the pricing kernel lowers the estimate of risk aversion these findings suggest that market incompleteness ought to be seen as an important component of solutions to the equity premium puzzle