does oil price variability affect asean exchange rates evidence from panel cointegration test abstractusing panel data this article investigates the long run relationship between real oil prices and real exchange rates for selected asean countries by utilizing quarterly data from 1973 q1 to 2013 q4 the modelling implementation starts with the determination of the stationarity condition of the variables which are found to be integrated of order one using maddala and wu s 1999 panel cointegration test the article finds evidence of cointegration among the variables the fully modified ols fmols and dynamic ols dols are then used to estimate the long run relationship between the variables followed by applying toda yamamoto causality test the findings exhibit bidirectional causality between real oil prices and real exchange rates in the long run where it is highly significant

forecasting exchange rates with commodity prices a global country analysis this paper investigates the predictive properties of import and export prices of commodities on the exchange rates a period from 1993 to 2016 is considered we find that forecasts of the exchange rate adding commodity export and import prices are superior to those neglecting these variables this holds irrespective of whether the countries are net exporters or importers of commodities however the forecasting power was even better in the 1990s and seems to have decreased since that that time nevertheless forecasts can even today be improved considerably by adding commodity prices

oil price volatility and stock price fluctuations in an emerging market evidence from south korea abstract how important are oil price fluctuations and oil price volatility on equity market performance what are the policy implications if volatility turns out to be significant we assess this issue in an economics finance nexus for korea using a vec model including interest rates economic activity real stock returns real oil prices and oil price volatility our main aim is to capture the effects of crude oil prices on the korean economy thoroughly covering the period of the asian financial crisis of 1997 which heavily affected the country and the oil price hikes in the early 1990s after the gulf war south korea was the country most hit by the financial crisis together with indonesia and thailand results indicate the dominance of oil price volatility on real stock returns and emphasize how this has increased over time oil price volatility can have profound effect on the time horizon of investment and firms need adjust their risk management procedures accordingly this increase in dependency has been found in other net oil importing emerging equity markets we test the relationship between oil price movements and economic activity by using modern time series techniques in a cointegrating framework we expand the standard error correction model by examining the dynamics of out of sample causality through the generalized variance decomposition and impulse response function techniques the evidence from persistence profiles also gives important guidelines based on how fast the entire system adjusts back to equilibrium in addition we find the cointegrating relationship to be stable and find that the linear error correction model to be more favorable than an asymmetric 2 period markov switching model

answering the skeptics yes standard volatility models do provide accurate forecasts a voluminous literature has emerged for modeling the temporal dependencies in financial market volatility using arch and stochastic volatility models while most of these studies have documented highly significant in sample parameter estimates and pronounced intertemporal volatility persistence traditional ex post forecast evaluation criteria suggest that the models provide seemingly poor volatility forecasts contrary to this contention we show that volatility models produce strikingly accurate interdaily forecasts for the latent volatility factor that would be of interest in most financial applications new methods for improved ex post interdaily volatility measurements based on high frequency intradaily data are also discussed

optimal social insurance with endogenous health this thesis consists of four independent papers covering macroeconomic topics such as unemployment insurance retirement business cycles and disability insurance the unifying theme connecting all papers is the importance of health when addressing these issues the first paper derives the optimal insurance against unemployment and disability in a setting where individuals can determine the probability of becoming disabled by exerting prevention effort the second paper develops a life cycle model of labor supply and retirement to study the interactions between health and the labor supply behavior of older workers in particular disability insurance and retirement the third paper looks at the role of health in a business cycle framework here health is treated as an asset that generates time and utility the last paper derives a theoretical model of the application decision for disability benefits and proposes an empirical strategy for measuring screening stringency in the disability insurance program

inflation and relative price variability parks study reexamined the authors show that richard w parks 1978 widely cited evidence on the correlation between the rate of inflation and the variability of relative prices in the united states during 1948 75 depends on one observation 1974 when the sample period is extended through 1989 the correlation depends on the observations for 1974 and 1980 since both are years of large oil price shocks the authors make the case that causation is likely to run from these shocks to relative price variability and inflation with accommodating monetary policy playing a role copyright 1993 by ohio state university press

optimal unemployment insurance for older workers this paper studies the optimal unemployment insurance for older workers in a repeated principal agent model where the search intensity of risk averse workers the agents is not observed by the risk neutral insurance agency the principal when unemployment benefits are the only available tool the insurance agency is not able to induce older workers to search for a job this is because of the short time horizon of workers close to retirement we propose to introduce a pension tax dependent on the length of the unemployment spell we show that this device performs better than a wage tax after re employment first it makes jobs more attractive as they are free of tax second because re employment will be short lived a pension tax is a more powerful incentive than a wage tax and provides more substantial fiscal gains to the agency finally a pension tax allows those workers near retirement who still do not exercise job search to smooth their consumption during their unemployment spell as if they could borrow against their future pension

assessing the effects of reemployment bonuses on job search a regression discontinuity approach abstract this study examines the impacts of reemployment bonuses that is the incentive payments to unemployment insurance ui recipients who find a job within a specified period using korean data a sharp discontinuity in treatment assignment at age 55 identifies the effect of increased reemployment bonuses on unemployment duration and on subsequent job duration the results indicate that increases in the reemployment bonus boost the job finding hazards of ui claimants early in their unemployment spells during the bonus qualification period and significantly shorten the duration of ui spells by 0 16 to 0 42 months 0 68 to 1 82 weeks in addition employment stability is not significantly affected by an increased bonus which implies no negative influence of the bonus on subsequent job match quality the simulated estimates show that the increase in tax revenue and the decrease in ui benefit payment caused by the behavioral response of ui recipients are large enough to offset the increased cost of the reemployment bonus

the value of the us dollar and its impact on oil prices evidence from a non linear asymmetric cointegration approach abstract the dynamic relationship between the real oil price and the us real effective exchange rate reer is one of the most important relationships for policy practitioners but the literature has largely disagreed on the direction of causation in cases when cointegration was found this paper addresses this issue and provides new evidence by using an approach that accounts for the potential of asymmetric cointegration and multiple structural breaks this was done using threshold autoregressive tar and momentum tar mtar models some key findings emerge first the variables are cointegrated with significant asymmetric error correction adjustments and the us reer is found to be weakly exogenous in this process when exogenous shocks cause disequilibrium then the adjustment is slower in the case of when a downward adjustment of real oil prices is needed to regain equilibrium compared to the case of when an upward adjustment is needed this asymmetry could be driven by downward rigidity in oil prices second it follows that long run causation is unidirectional going from the us reer to real oil prices however there is bidirectional causation in the short run the estimations accounted for four structural breaks found in the sample overall findings imply that countries exporting to the us may lose competitiveness in the long run not only because of an increased conversion price but also through the upward pressure on oil prices from a us perspective increased competitiveness leads to increased real oil prices which may temper the gains of oil intensive exports in the long run

optimal welfare to work programs a welfare to work wtw program is a mix of government expenditures on various labour market policies targeted to the unemployed e g unemployment insurance m job search monitoring m social assistance sa wage subsidies this paper provides a dynamic principal agent framework suitable for analysing chief features of an optimal wtw program such as the sequence and duration of the different policies the dynamic pattern of payments along the unemployment spell and the emergence of taxes subsidies upon re employment the optimal program endogenously generates an absorbing policy of last resort social assistance characterized by a constant lifetime payment and no active participation by the agent human capital depreciation is a necessary condition for policy transitions to be part of an optimal wtw program the typical sequence of policies is quite simple the program starts with standard ui then switches into monitored search and finally into sa the optimal benefits are decreasing during unemployment insurance and constant during both jm and sa whereas taxes subsidies can be either increasing or decreasing with duration during ui they must decrease increase during a phase of jm in a calibration exercise we use our model to analyse quantitatively the features of the optimal program for the u s economy with respect to the existing u s system the optimal wtw scheme delivers sizeable welfare gains to unskilled workers because the incentives to search for a job can be retained even while delivering more insurance and using costly monitoring less intensively

the economic effects of unemployment insurance in canada an empirical analysis of ui disentitlement this article provides an overview of the canadian unemployment insurance ui program including its evolution salient features relative size and knowledge about its labor market impacts understanding of these impacts is limited and we conclude that an event study approach is a promising way to further this knowledge we examine the effects of the 1976 ui disentitlement of the elderly on their labor force behavior and find evidence of significant adverse selection effects interactions with the public pension system suggest that poverty among the elderly could be best addressed through changes in programs other than ui

computing multi period information constrained optima this paper presents a detailed theoretical derivation and justification for methods used to compute solutions to a multi period including infinite period continuum agent unobservedeffort economy actual solutions are displayed illustrating cross sectional variability in consumption and labour effort in the population at a point in time and variability for a typical individual over time the optimal tradeoff between insurance and incentives is explored and the issue of excess variability is addressed by consideration of the analogue full information economy and various restricted contracting regimes

linkages among energy price exchange rates and stock markets evidence from emerging african economies this study examines the dynamic links among oil prices foreign exchange rates and stock markets in emerging africa using recent 10 years data and var bekk garch forecasting framework we find evid

china and the relationship between the oil price and the dollar abstract we study cointegration and causality between the real price of oil and the real price of the dollar over the 1974 2004 period our results suggest that a 10 rise in the oil price coincides with a 4 3 appreciation of the dollar in the long run and that the causality runs from oil to the dollar through the development of a theoretical model we then investigate possible reasons why this relationship could be reversed in the future due to the emergence of china as a major player on both the oil and the foreign exchange markets

the response of real exchange rates to various economic shocks substantial fluctuations in real exchange rates i e deviations from purchasing power parity ppp which closely mirror movements in nominal rates have been one of the most notable international economic events since the breakdown of the bretton woods system dornbusch s disequilibrium theory 9 which presumes different speeds of adjustment in assets and goods markets offers an explanation for temporary deviations from ppp only models assuming ppp as a long run relationship have not been successful in interpreting the movements of the real exchange rates although studies conducted for countries experiencing high or hyper inflation provide evidence favoring ppp 42 30 29 the empirical evidence on ppp for industrialized low inflation countries is not generally favorable 1 this is consistent with the view that ppp may hold better in high inflation countries where the disturbances to their economies are mostly monetary in origin 31 123 24 but ppp may not hold well when the real disturbances which change equilibrium relative prices dominate statistical evidence indicates that the real exchange rates of many countries are likely to be nonstationary or have long memory that is changes in the real values of many currencies tend to persist for very long period of time this persistence implies that fluctuations in the real exchange rates are largely due to long lasting effect of real disturbances after revealing that ppp does not hold as a long run concept for several exchange rates flynn and boucher 12 121 suggest that one possible explanation is that there are time varying real factors that are omitted from the ppp relationship there are several well established reasons why the real exchange rates may change in response to real disturbances in the first place permanent exogenous shocks to the tradable sector of the economy call for changes in competitiveness for instance a rise in the real price of oil will worsen the balance of trade position of a net oil importing country and therefore call for a real depreciation of the currency of the country in order to improve its competitive position 32 second when countries are growing at different rates productivity bias will typically result in

breakthroughs deadlines and self reported progress contracting for multistage projects we study the optimal incentive schemes for multistage projects staged financing pervasive in both venture capital and research grants arises as a feature of the optimal contract the nature of progress plays an important role when progress is tangible incentives are provided through a series of deadlines and a reward scheme that decreases over time early progress in one stage gives the agent more time and funding to complete the next one when progress is intangible unverifiable progress reports are used despite the fact that the information in the report has no social value the optimal contract involves a soft deadline wherein the principal guarantees funding up to a certain date if the agent reports progress at that date then the principal gives him a relatively short deadline to complete the project if not then a probationary phase begins in which the project is terminated at a constant rate until progress is reported we explore the implications for welfare and optimal project design

optimal use of labor market policies the role of job search assistance abstract this paper demonstrates how economic theory can be combined with state of the art empirics to make quantitative statements about optimal policy using a large administrative data set for west germany as well as nonparametric and semiparametric estimation techniques i parameterize the model proposed by pavoni and violante 2005 2007 for the optimal choice of different financial and activation measures for unemployed workers the parameterized model is used to study the role of job search assistance in optimal welfare to work programs and assess the optimality of the west german policy in the period 2000 to 2002

unemployment insurance and precautionary saving abstract models of precautionary saving imply that households will hold more assets when faced with greater income uncertainty however previous empirical studies of income uncertainty have produced somewhat mixed support for the precautionary saving hypothesis in this paper we note that differences in the state contingent income stream available to workers through the unemployment insurance ui program provides an excellent source of variation for testing the presence of a precautionary savings motive simulations of a stochastic life cycle model suggest that a ui system similar to the type currently in place in the u s can lead to a significant reduction in the assets accumulated by a median worker moreover there is considerable variation in the ui benefit schedules for workers living in different states in the u s which provides an exogenous source of variation for empirically testing the precautionary saving hypothesis we carry out this test using data on expected ui benefit replacement rates and financial assets held by households in the survey of income and program participation our empirical results are consistent with the predictions of the model and suggest that reducing the ui benefit replacement rate by 50 percent would increase gross financial asset holdings by 14 percent or 241 for the average worker we also find empirical evidence that this crowd out effect of ui on household saving is stronger for those facing higher unemployment risk and weaker for older workers both of which are implications from our precautionary saving model

causal flows between oil and forex markets using high frequency data asymmetries from good and bad volatility abstract this paper investigates the causal linkages in volatility between crude oil prices and six major bilateral exchange rates against the u s dollar in the time frequency space using high frequency intraday data special attention is paid to the potential asymmetries in the causal effects between oil and forex markets the wavelet based granger causality method proposed by olayeni 2016 is applied to quantify the causal relations in the time and frequency domains simultaneously moreover the realized semivariance approach of barndoff nielsen et al 2010 is used to account for possible asymmetries in the transmission of volatility shocks the empirical results show that the significant causal links between oil prices and exchange rates are mainly concentrated in the long run and during periods of increased economic and financial uncertainty such as the global financial crisis and the subsequent european sovereign debt crisis further the causal effects from currency markets to the crude oil market are stronger than in the opposite direction consistent with the forward looking nature of exchange rates the role of the u s dollar as the key invoicing currency for global oil trading and the expanding financialization of the oil market since the mid 2000s in addition significant asymmetries coming from good and bad volatility are found at longer horizons specifically bad volatility seems to dominate good volatility in terms of the importance of transmission of volatility shocks

econometric analysis of vast covariance matrices using composite realized kernels and their application to portfolio choice we propose a composite realized kernel to estimate the ex post covariation of asset prices these measures can in turn be used to forecast the covariation of future asset returns composite realized kernels are a data efficient method where the covariance estimate is composed of univariate realized kernels to estimate variances and bivariate realized kernels to estimate correlations we analyze the merits of our composite realized kernels in an ultra high dimensional environment making asset allocation decisions every day solely based on the previous day s data or a short moving average over very recent days the application is a minimum variance portfolio exercise the dataset is tick by tick data comprising 437 u s equities over the sample period 2006 2011 we show that our estimator is able to outperform its competitors while the associated trading costs are competitive

roughing it up including jump components in the measurement modeling and forecasting of return volatility a rapidly growing literature has documented important improvements in financial return volatility measurement and forecasting via use of realized variation measures constructed from high frequency returns coupled with simple modeling procedures building on recent theoretical results in barndorff nielsen and shephard 2004a 2005 for related bi power variation measures the present paper provides a practical and robust framework for non parametrically measuring the jump component in asset return volatility in an application to the dm exchange rate the s p500 market index and the 30 year u s treasury bond yield we find that jumps are both highly prevalent and distinctly less persistent than the continuous sample path variation process moreover many jumps appear directly associated with specific macroeconomic news announcements separating jump from non jump movements in a simple but sophisticated volatility forecasting model we find that almost all of the predictability in daily weekly and monthly return volatilities comes from the non jump component our results thus set the stage for a number of interesting future econometric developments and important financial applications by separately modeling forecasting and pricing the continuous and jump components of the total return variation process

a new approach to decomposition of economic time series into permanent and transitory components with particular attention to measurement of the business cycle abstract this paper introduces a general procedure for decomposition of non stationary time series into a permanent and transitory component allowing both components to be stochastic the permanent component is shown to be a random walk with drift and the transitory or cyclical component is a stationary process with mean zero the decomposition methodology which depends only on past data and therefore is computable in real time is applied to the problem of measuring and dating business cycles in the portwar u s economy we find that measured expansions and contractions are of roughly equivalent duration and that our dating of cyclical episodes tends to lead the traditional nber dating and to a lesser extent the growth cycle chronology of zarnowitz and boschan 1977

the nexus between oil price and russia s real exchange rate better paths via unconditional vs conditional analysis abstract instead of analyzing the causality between two time series unconditional analysis as it is usually done the present study deals with the nexus between oil price and russia s real exchange rate conditioning upon potential control variables at well specified horizons and on a frequency by frequency basis this research accounts also for the possible transient linkages and signal discontinuities a major finding of this paper is deeply suggestive of a sharp causality running from oil price to real exchange rate in lower frequencies this implies that russia should better tackle with turbulence triggered by oil price and continue to reduce its energy dependency via drastic and proactive measures the economic and fiscal initiatives of putin administration may help to cope with sudden shocks to lessen the great oil dependence and to build confidence needed for economic recovery while our research does not say much about the routes through which oil price may affect differently real exchange rate it clearly indicates the presence of short term relationship conditional to gdp government expenditures terms of trade and productivity differential the conditional analysis and signal detection appear as meaningful exercises to find new insights into the focal issue

markov perfect risk sharing moral hazard and limited commitment abstract we define characterize and compute markov perfect risk sharing contracts in a dynamic stochastic economy with endogenous asset accumulation and simultaneous limited commitment and moral hazard frictions we prove that markov perfect insurance contracts preserve standard properties of optimal insurance with private information and are not more restrictive than a long term contract with one sided commitment markov perfect contracts imply a determinate asset time path and a non degenerate long run stationary wealth distribution quantitatively we show that markov perfect risk sharing contracts provide sizably more consumption smoothing relative to self insurance and that the welfare gains from resolving the commitment friction are larger than the gains from resolving the moral hazard friction at low asset levels while the opposite holds for high asset levels

oil prices and real exchange rates in this paper we investigate the long run relationship between real oil prices and real exchange rates by using a monthly panel of g7 countries from 1972 1 to 2005 10 we first test whether exchange rates are cointegrated with real oil prices it is shown that real oil prices may have been the dominant source of real exchange rate movements and that there is a link between real oil prices and real exchange rates we then examine the ability of real oil prices to forecast future real exchange returns panel predictive regression estimates suggest that real oil prices have significant forecasting power the out of sample prediction performances demonstrate greater predictability over longer horizons

portfolio management using realized covariances evidence from brazil abstract it is often argued that intraday returns can be used to construct covariance estimates that are more accurate than those based on daily returns however it is still unclear whether high frequency data provide more precise covariance estimates in markets more contaminated from microstructure noise such as higher bid ask spreads and lower liquidity we address this question by investigating the benefits of using high frequency data in the brazilian equities market to construct optimal minimum variance portfolios we implement alternative realized covariance estimators based on intraday returns sampled at alternative frequencies and obtain their dynamic versions using a multivariate garch framework our evidence based on a high dimensional data set suggests that realized covariance estimators performed significantly better from an economic point of view in comparison to standard estimators based on low frequency close to close data as they delivered less risky portfolios

repeated insurance relationships in a costly state verification model with an application to deposit insurance abstract we consider the problem of an insurer who enters into a repeated relationship with a set of risk averse agents in the presence of ex post verification costs the insurer wishes to minimize the expected cost of providing these agents a certain expected utility level we characterize the optimal contract between the insurer and the insured agents we then apply the analysis to the provision of deposit insurance our results suggest in a deposit insurance context that it may be optimal to utilize the discount window early on and to make deposit insurance payments only later or not at all

household search and the aggregate labor market we develop a theoretical model with labour market frictions incomplete financial markets and with households which have two members households face unemployment risks but their members adjust their labour supplies to insure against unemployment we use the model to explain the cyclical properties of aggregate employment and participation as in the u s data the model predicts that the participation rate the fraction of individuals that want jobs is not strongly correlated with aggregate economic activity this property is in sharp contrast to the strongly procyclical participation predicted by both neoclassical models and models with search frictions when we assume bachelor households or households with infinitely many members complete markets in the two member household model and in the data primary earners are always in the labour force secondary earners have a mildly countercyclical participation rate and a mildly procyclical employment rate their behaviour insures the household against unemployment risks

endogenous groups and dynamic selection in mechanism design abstract we create a dynamic theory of endogenous risk sharing groups with good internal information and their coexistence with relative performance individualistic regimes which are informationally more opaque inequality and organizational form are determined simultaneously numerical techniques and succinct reformulations of mechanism design problems with suitable choice of promised utilities allow the computation of a stochastic steady state and its transitions regions of low inequality and moderate to high wealth utility promises produce the relative performance regime while regions of high inequality and low wealth produce the risk sharing group regime if there is a cost to prevent coalitions risk sharing groups emerge at high wealth levels also transitions from the relative performance regime to the group regime tend to occur when rewards to observed outputs exacerbate inequality while transitions from the group regime to the relative performance regime tend to come with a decrease in utility promises some regions of inequality and wealth deliver long term persistence of organization form and inequality while other regions deliver high levels of volatility

the role of energy prices in the great recession a two sector model with unfiltered data we investigate the role of energy shocks during the great recession we study the behaviour of the uk energy and non energy intensive sectors firms in a real business cycle rbc model using unfiltered data the model is econometrically estimated and tested by indirect inference output contraction during the great recession was largely caused by energy price and sector specific productivity shocks all of which are non stationary and hence tend to dominate the sample variance decomposition we also found that the channel by which the energy price shock reduces output in the model is via the terms of trade these fall permanently when world energy prices increase and as substitutes for energy inputs are strictly limited there are few reactions via production channels therefore there is no other way to balance the deteriorating current account than through lower domestic absorption

comparing svars and sems two models of the uk economy the structural vector autoregression svar and simultaneous equation macroeconometric model sem styles of empirical macroeconomic modelling are compared and contrasted with reference to two models of the uk economy namely the long run structural var model of garratt lee pesaran and shin and the compact model various styles of impulse response analysis are also compared and contrasted and used to illustrate model properties a reverse engineering procedure is used to infer long run relations of compact comparable to the glps cointegrating relations copyright c 2005 john wiley t sons ltd

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

unemployment insurance with a hidden labor market abstract we consider the problem of optimal unemployment insurance ui in a repeated moral hazard framework unlike existing literature unemployed individuals can secretly participate in a hidden labor market this extension modifies the standard problem in three dimensions first it imposes an endogenous lower bound for the lifetime utility that a contract can deliver second it breaks the identity between unemployment payments and consumption and third it hardens the encouragement of search effort the optimal unemployment insurance system in an economy with a hidden labor market is simple with an initial phase in which payments are relatively flat during unemployment and with no payments for long term unemployed individuals this scheme differs substantially from the one prescribed without a hidden labor market and resembles unemployment protection programs in many countries

adverse selection and moral hazard quantitative implications for unemployment insurance abstract a model of optimal unemployment insurance with adverse selection and moral hazard is constructed the model generates both qualitative and quantitative implications for the optimal provision of unemployment insurance qualitatively for some agents incentives in the optimal contract imply consumption increases over the duration of non employment calibrating the model to a stylized version of the u s economy quantitatively illustrates these theoretical predictions the optimal contract achieves a welfare gain of 1 94 relative to the current u s system an additional 0 87 of gains relative to a planner who ignores adverse selection and focuses only on moral hazard

nonlinear causality between crude oil price and exchange rate a comparative study of china and india while several studies have examined the linear causal relationship between oil prices and exchange rates little is known about the nonlinear causality between these two variables the present paper tries to fill this research gap in the context of india and china by applying the hiemstra and jones 1994 nonlinear granger causality test to the var residuals the study finds a significant bi directional nonlinear granger causality between oil prices and exchange rates in both countries the findings suggest that the nonlinearity of oil price influences the exchange rate irrespective of the exchange rate regimes further to check robustness the persistence in the variance of oil price and exchange rate is taken into account using a garch 1 1 model while the results consistently hold in the case of india with respect to china a unidirectional causality runs from exchange rate to oil price however the oil price in china does not granger cause exchange rate

can welfare abuse be welfare improving abstract i analyze quantitatively a model of labor search with unemployment insurance ui savings voluntary quits and various labor attachment requirements in particular i study welfare consequences of a powerful reform giving ui entitlement to workers quitting their jobs voluntarily in order to search for another one results of the model calibrated to the us labor market show that there may be significant welfare gains associated with pursuing a generous entitlement policy for quitters as compared to the us status quo moreover i employ the assumption of monetary search costs and show that it can explain the empirically documented unemployed worker search behavior finally by inducing different unemployment benefit eligibility requirements the model identifies a concrete policy that could help us understand differences in the unemployment rate match quality and income inequality between the us and europe

employment spells and unemployment insurance eligibility requirements in this paper we examine whether the requirements that workers must satisfy to qualify for unemployment insurance ui benefits in any succeeding period of joblessness affect the duration of employment spells this behavioral consequence of a ui system has been neglected in empirical research which has instead focused on the effects of ui parameters on the actions of the unemployed the effect is identified by a unique change in the eligibility requirements of the canadian ui system in 1990 which increased the weeks of employment required to establish ui eligibility we provide a variety of estimates of this behavioral effect in our preferred set of results we find a significant increase in the employment hazard in the week that an individual satisfies the eligibility requirement in many regions of the country in the spirit of feldstein s 1976 study of temporary layoffs the results provide new evidence of the impact of ui system parameters on the actions of employers and workers

long run equilibrium real exchange rates and oil prices abstract using cointegration and causality tests this paper demonstrates that the nonstationary behavior of us dollar real exchange rates over the post bretton woods era is due to the nonstationary behavior of real oil prices

growth and risk sharing with private information abstract we examine the impact of incomplete risk sharing on growth and welfare the source of market incompleteness in our economy is private information a household s idiosyncratic productivity shock is not observable by others risk sharing between households occurs through long term contracts with intermediaries we find that incomplete risk sharing tends to reduce the rate of growth relative to the complete risk sharing benchmark numerical examples indicate that the welfare cost and the growth effect of private information are small

realized garch a joint model for returns and realized measures of volatility summary we introduce a new framework realized garch for the joint modeling of returns and realized measures of volatility a key feature is a measurement equation that relates the realized measure to the conditional variance of returns the measurement equation facilitates a simple modeling of the dependence between returns and future volatility realized garch models with a linear or log linear specification have many attractive features they are parsimonious simple to estimate and imply an arma structure for the conditional variance and the realized measure an empirical application with dow jones industrial average stocks and an exchange traded index fund shows that a simple realized garch structure leads to substantial improvements in the empirical fit over standard garch models that only use daily returns copyright 2011 john wiley sons ltd

optimal unemployment insurance with human capital depreciation and duration dependence this paper studies the effect of human capital depreciation and duration dependence on the design of an optimal unemployment insurance ui scheme our results partially confirm those obtained in most previous studies benefits should decrease with unemployment duration the optimal program also generates two main novel features which are not present in stationary models first if human capital depreciates rapidly enough during unemployment ui transfers are bounded below by a minimal assistance level that arises endogenously in the efficient program second we study the optimality of imposing a history contingent wage tax after reemployment our numerical simulations based on the spanish and us economies show that the wage tax should decrease with the length of worker s previous unemployment spell and become a wage subsidy for long term unemployed workers as a by product of our study we develop a systematic approach suitable for studying recursively a wide range of dynamic moral hazard problems and other models with similar characteristics

the relationship between oil prices and exchange rates revisiting theory and evidence abstract this paper reviews existing theoretical and empirical research on the relationship between oil prices and exchange rates we start with theoretical transmission channels which point to bi directional causality empirical research is classified and shows that the evidence varies substantially depending on sample country choice and empirical method yet there are some common patterns i strong links between exchange rates and oil prices are frequently observed over the long run and ii either exchange rates or oil prices are a potentially useful predictor of the other variable in the short run but the effects are strongly time varying we also identify some important avenues for future research

dynamic link between oil prices and exchange rates a non linear approach abstract we explore the non linear relationship between crude oil prices and exchange rates of major currencies from quantitative and structural perspectives by utilizing bivariate normal mixture model the correlation coefficients between oil prices and exchange rates demonstrate that their dependences typically start from 2004 then dynamically change over time then we investigate whether business cycle and oil price shocks as two possible exogenous factors affect the dependence structure of oil fx linkage we find significant structural heterogeneity during economic expansion while little evidence of heterogeneity in recession this finding provides alternative interpretations for the enhanced dependence between oil prices and exchange rates and generates implications of financialization in commodity market in terms of oil price shocks kilian 2009 the normal mixture model captures significant heterogeneity implying that unstable oil fx dependence structure is frequently associated with oil aggregate demand shocks and oil specific demand shocks with an emphasis on the dynamic weights of two underlying states we interestingly find that structural heterogeneities coincide with a variety of geopolitical and economic events the application of normal mixture not only provide us knowledge of non linear relationship between oil prices and exchange rates but also guidance for investors in risk management and portfolio diversification complementary to the traditional portfolio theory based on normal distribution

payments systems design in deterministic and private information environments abstract the first setup we study is a deterministic model with spatial separation where we consider alternative payments systems institutions and their implications for allocation and welfare a payments system with period by period settlement in outside money improves on decentralized exchange an efficient allocation is supported by a payments system where settlement is not imposed in the second model there is random matching and unobserved productivity shocks and preference shocks we explore how risk should be shared optimally in this economy and interpret the results in terms of how actual payments systems should operate journal of economic literature classification numbers e4 e5

multivariate high frequency based volatility heavy models this paper introduces a new class of multivariate volatility models that utilizes high frequency data we discuss the models dynamics and highlight their differences from multivariate garch models we also discuss their covariance targeting speci cation and provide closed form formulas for multi step forecasts estimation and inference strategies are outlined empirical results suggest that the heavy model outperforms the multivariate garch model out of sample with the gains being particularly signi cant at short forecast horizons forecast gains are obtained for both forecast variances and correlations

interaction between oil and us dollar exchange rate nonlinear causality time varying influence and structural breaks in volatility abstractthis article examines the nonlinear granger causality and time varying influence between crude oil prices and the us dollar usd exchange rate using the hiemstra and jones hp test the diks and panchenko dp test and the time varying parameter structural vector autoregression model by applying the iterated cumulative sums of squares icss algorithm and the dcc garch model the effects of structural breaks in volatility of the two markets are also investigated the empirical analysis indicates that first crude oil prices are the nonlinear granger cause of the usd exchange rate but not vice versa second the usd exchange rate exerts a stronger and more stable negative influence on crude oil prices in the short term and the influence gradually weakens after 2012 finally ignoring structural breaks can increase the negative volatility correlation between the oil and usd exchange rate markets which is particularly remarkable during the financial crisis

a re examination of stationarity of energy consumption evidence from new unit root tests abstract in this paper we re examine the stochastic behaviour of per capita total primary energy consumption across 178 countries around the world for this purpose in addition to conventional unit root tests we apply newly developed tests that allow for nonlinear adjustments and structural breaks in the data generating process the results of the unit root tests show that allowing for structural breaks and nonlinearity result in more frequent rejection of the null hypothesis of unit root suggesting that most of the series under consideration follow a stationary process these findings imply that both energy economists and policy makers must be careful and take account of possible nonlinearities and structural breaks in their analyses of energy consumption in addition the results imply that government interventions into the energy markets in most countries have no effect in the long run although the short run effects of the interventions depend on the size and the direction of interventions

moral hazard optimal unemployment insurance and experience rating abstract this paper is concerned with evaluating alternative unemployment insurance ui schemes in a dynamic economy with moral hazard we consider changes in the size and duration of ui benefits and the effects of experience rating and use a dynamic contracting approach to determine a benchmark optimal allocation radical changes in the current ui system increase welfare but not by much a move to full experience rating has distributional effects but the aggregate effects are negligible

unemployment insurance and job duration in canada we use data from the canadian 2 year longitudinal labour market activity survey of 1986 87 to estimate the effect of the unemployment insurance ui system on job duration particular attention is focused on the entrance requirements of the ui system which relate eligibility for ui benefits to an individual s recent employment history the article makes operational the ui entrance requirement provisions which take into account variations in the regional unemployment rate controlling for many personal and job characteristics we find evidence that a significant number of jobs terminate when they have reached the duration that would permit a ui claim

training and search during unemployment displaced workers often experience large losses in earnings even a long time after reemployment training programs during unemployment mitigate these losses but also affect the unemployed s willingness to search this paper analyzes how mandatory training programs affect the optimal design of unemployment insurance and how the training intensity should evolve during the unemployment spell the introduction of training reverses the optimal consumption dynamics during the unemployment spell and makes it optimal to incentivize the long term unemployed to find employment despite the depreciation of their human capital targeting training programs towards the long term unemployed however is optimal only if the fall in human capital upon displacement is small relative to the depreciation during unemployment

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

estimating incentive and welfare effects of nonstationary unemployment benefits the distribution of unemployment duration in our equilibrium matching model with spell dependent unemployment benefits displays time varying exit rates building on semi markov processes we translate these rates into an expression for the aggregate unemployment rate structural estimation using german microdata allows us to discuss the effects of an unemployment benefit reform hartz iv the reform reduced unemployment by less than 0 1 percentage points contrary to general beliefs the net wage for most skill and regional groups increased taking the insurance effect of unemployment benefits into account however the reform is welfare reducing for 76 of workers

non linearities in the dynamics of oil prices abstract examining stationarity is of particular importance and represents the first step in empirical time series research non stationarity invalidates many of the results obtained from standard techniques and therefore requires special treatment because oil prices play an important role in affecting economic variables this paper examines the stationarity of real oil prices brent dubai wti and the world over the period 1973 2 2011 2 real oil prices are expressed in the currencies of seven asian countries indonesia japan korea malaysia the philippines singapore and thailand and in the u s dollar while using linear unit root tests without structural breaks shows no evidence of stationarity allowing for breaks shows very limited evidence of stationarity we argue that these results are attributed to the presence of nonlinearities in the behavior of oil prices testing for nonlinearity shows significant evidence of nonlinearity in all the cases with evidence of exponential smooth transition autoregression estar nonlinearity type in most cases applying unit root tests that account for two types of nonlinearities smooth transition and nonlinear deterministic trends reveals evidence of stationarity in all the cases

risk dependence of covar and structural change between oil prices and exchange rates a time varying copula model abstract this paper analyses the dynamic dependence between wti crude oil and the exchange rates of the united states and china taking structural changes of dependence into account by using six time varying copula models upside and downside conditional values at risk covars are introduced specifically to measure the upward and downward risk dependences between oil prices and exchange rates the findings indicate a structural break point of dependence exists between daily or weekly crude oil and the us dollar index the dependence between crude oil and the rmb exchange rate is faintly positive with lower tail dependence while the dependence between crude oil and the us dollar index is significantly negative with lower upper and upper lower tail dependence finally the covars results show that there is significant risk spillover from crude oil to chinese and the us exchange rate markets furthermore the spillover effect is significantly asymmetry in chinese exchange rate market in response to rising and falling oil returns while the asymmetry of spillover effect for the us dollar index is not significant

is there a homogeneous causality pattern between oil prices and currencies of oil importers and exporters although the link between oil prices and dollar exchange rates has been frequently analyzed a clear distinction between prices and nominal exchange rate dynamics and a clarification of the issue of causality has not been provided in addition previous studies have mostly neglected nonlinearities which for example may stem from exogenous oil price shocks using monthly data for various oil exporting and oil importing countries this study contributes to the clarification of those issues we discriminate between long run and time varying short run dynamics using a markov switching vector error correction model in terms of causality the results differ between the economies under observation but suggest that the most important causality runs from exchange rates to oil prices with a depreciation of the dollar triggering an increase in oil prices on the other hand changes in nominal oil prices are responsible for ambiguous real exchange rate effects mostly through the price differential and partly also through a direct influence on the nominal exchange rate overall the fact that the adjustment pattern frequently differs between regimes underlines the fact that the relationships are subject to changes over time suggesting that nonlinearities are an important issue when analyzing oil prices and exchange rates

oil price fluctuation volatility spillover and the ghanaian equity market implication for portfolio management and hedging effectiveness abstract this study attempts to contribute to the literature on stock markets and energy prices by examining the dynamic volatility and volatility transmission between oil and ghanaian stock market returns in a multivariate setting using the recently developed var garch var agarch and dcc garch frameworks in turn the models results are used to compute and analyze the optimal weights and hedge ratios for oil stock portfolio holdings for comparison purposes and to put the paper more in the perspective of west africa the nigerian stock market is also included in the analysis our findings point to the existence of significant volatility spillover and interdependence between oil and the two stock market returns while spillover effects are stronger for nigeria the transmission of volatility is much more apparent from oil to stock than from stock to oil in the case of ghana also the study demonstrates evidence of short term predictability in oil and stock price changes through time and reveals that conditional volatility changes more rapidly as result of substantial effects of past volatility rather than past news shocks for all market returns moreover we show that there is a slightly more effective hedge in the two stock markets under the dcc garch framework our preferred model compared to the other two models although hedging effectiveness is much greater for ghana on the whole our findings for optimal hedge ratios are consistent with other studies and particularly the view that oil assets should be an integral part of a diversified portfolio of stocks and suggest that a better understanding of volatility links is crucial for portfolio management in the presence of oil price risk finally the existence of multivariate asymmetric effects and dynamic conditional correlations as revealed by the var agarch and dcc garch models make it clear that the assumptions of symmetric effects and constant conditional correlations are not supported empirically

improving markov switching models using realized variance this paper proposes a class of models that jointly model returns and ex post variance measures under a markov switching framework both univariate and multivariate return versions of the model are introduced bayesian estimation can be conducted under a fixed dimension state space or an infinite one the proposed models can be seen as nonlinear common factor models subject to markov switching and are able to exploit the information content in both returns and ex post volatility measures applications to u s equity returns and foreign exchange rates compare the proposed models to existing alternatives the empirical results show that the joint models improve density forecasts for returns and point predictions of return variance the joint markov switching models can increase the precision of parameter estimates and sharpen the inference of the latent state variable

modelling and forecasting multivariate realized volatility summary this paper proposes a methodology for dynamic modelling and forecasting of realized covariance matrices based on fractionally integrated processes the approach allows for flexible dependence patterns and automatically guarantees positive definiteness of the forecast we provide an empirical application of the model which shows that it outperforms other approaches in the extant literature both in terms of statistical precision as well as in terms of providing a superior mean variance trade off in a classical investment decision setting copyright 2010 john wiley sons ltd

cointegration and tests of purchasing power parity nonstationarity in the levels of spot exchange rates and domestic and foreign price indices makes the use of conventional tests of the absolute version of purchasing power parity ppp inappropriate if ppp is true inter country commodity arbitrage ensures that deviations from a linear combination of spot exchange rates and domestic and foreign price levels should be stationary under these conditions exchange rates and price levels should form a cointegrated system we find the null hypothesis of no cointegration cannot be rejected for all five countries thus violating the long run absolute version of ppp

intra daily volatility spillovers in international stock markets abstract using a novel four phase model based upon a conditional autoregressive wishart framework for realized variances and covariances we quantify intra daily volatility spillovers within and across the us german and japanese stock markets before and during the subprime crisis we find significant short term spillovers from one stock market to the next trading market which have substantially intensified during the crisis indicating a global volatility contagion coming from the us market the strongest contagion with the largest burst of spillover effects from and to foreign markets is observed for the japanese market which was prior to the crisis fairly uncoupled from the german and us market we also find that the crisis leads to a significant reduction of the general persistence of volatility shocks in international stock markets hence it appears that during the turmoil of the crisis news generating volatility become outdated more quickly than before the crisis

unemployment insurance in the united states layoff incentives and cross subsidies we survey unemployment insurance ui in the united states and provide new evidence on the ui payroll tax most ui receipt is due to firms that pay part of the ui costs of their layoffs but weak experience rating leads most firms to pay considerably less than the full costs industries consistently receiving subsidies from the ui system are construction manufacturing and mining finally a large fraction of layoffs resulting in payment of ui are made by firms that are not charged for the costs of the claim because they have employed the individual for less than 2 quarters

optimal life cycle unemployment insurance we argue that us welfare would rise if unemployment insurance were to be increased for young workers and decreased for old this is because young workers have little means to smooth consumption during unemployment and want jobs to accumulate high return human capital so unemployment insurance is highly valuable to them while the induced moral hazard problem is mild we consider a life cycle model with unemployment risk and endogenous search eort that we calibrate to match us labor market institutions we nd that allowing unemployment replacement rates and other government transfers to decline with age yields sizeable welfare gains which amount to around two thirds of the gains attained under the constrained optimal scheme for unemployment insurance over the life cycle

the effects of oil price shocks on asian exchange rates evidence from quantile regression analysis abstract this paper investigates the effects of oil price shocks on asian exchange rates we employ quantile regression analysis and allow for structural breaks and asymmetry our results indicate that positive and negative oil price shocks have asymmetrical effects on exchange rate returns that vary in significance size and sign throughout the distribution of exchange rate returns the impact of oil price shocks is also affected by market conditions bearish and bullish currency markets during bullish markets in domestic currencies at lower quantiles of currency movements in terms of u s dollar exchange rates rising oil prices cause further appreciation for indonesia korea the philippines and thailand currencies during bearish markets in the domestic currencies at higher quantiles of exchange rate movements in terms of u s dollar exchange rates rising falling oil price causes further currency depreciation for indonesia malaysia thus currencies respond differently to oil price shocks under extreme bullish or bearish currency market conditions and the impact of rising or falling oil prices on foreign exchange markets can vary by country and market conditions

on repeated moral hazard with discounting in this paper we analyze optimal contracts in an infinitely repeated agency model in which both the principal and agent discount the future we show that there is a stationary representation of the optimal contract when the agent s conditional discounted expected utility is used as a state variable this representation reduces the multi period problem to a static variational problem which can be analyzed using standard variational techniques this reduction is used to obtain several properties of the contract

on optimal unemployment compensation abstract the design of an optimal unemployment compensation scheme is analyzed using a dynamic principal agent relationship between a risk neutral planner the principal and risk averse workers the agents where the planner s inability to observe workers job search efforts creates a moral hazard problem to design an implementable scheme we require that each agent is guaranteed a minimum level of expected discounted utility regardless of his past history in contrast with previous studies we find that the optimal contract is quite close to actual unemployment compensation schemes both qualitatively and quantitatively

political economy of mechanisms we study the optimal mirrlees taxation problem in a dynamic economy in contrast to the standard approach where the taxation mechanism is operated by a benevolent planner with full commitment power we focus on economies in which policy decisions are made by self interested politicians who cannot commit to policies the society controls politicians using elections we show that the provision of incentives to politicians can be partly separated from redistribution across agents and that political economy constraints can be modeled as introducing additional aggregate distortions in the dynamic mirrlees problem we provide conditions under which the political economy distortions persist or disappear in the long run if the politicians are as patient as the agents the best sustainable mechanism leads to an asymptotic allocation where the aggregate distortions arising from political economy disappear in contrast when politicians are less patient than the citizens positive aggregate labor and capital taxes remain even asymptotically we conclude by providing a brief comparison of centralized

optimal unemployment insurance and employment history in existing unemployment insurance programmes it is standard to condition eligibility on the previous employment record of unemployed workers the purpose of this article is to study conditions under which the efficient contract exhibits these properties in order to do so we characterize the optimal unemployment insurance contract in asymmetric information environments in which workers experience multiple unemployment spells we show that if quits cannot be distinguished from layoffs it is optimal to condition the benefits paid to unemployed workers on their employment history in particular the coverage should increase with the length of previous employment spells copyright wiley blackwell

the influence of the international oil prices on the real effective exchange rate in romania in a wavelet transform framework article i nfo the purpose of this paper is to assess the empirical influence of oil prices on the real effective exchange rate in romania in a wavelet transform framework more precisely we investigate to what extent oil prices impact the real effective exchange rate in an eastern european transition country characterised by a low level of retail fuel prices and by an important growth rate of these prices as compared to the other eu countries for this purpose we use a discrete wavelet transform approach and scale by scale granger causality tests we find that oil prices have a strong influence on the real effective exchange rate in the short run but also for large time horizons these results are important considering the fact that in a classical granger causality linear framework for the entire sample we find that oil prices have no influence on the real effective exchange rate the findings remainrobust whenresampling the initial 1986 2009period orwhen weuse analternative continuous wavelet transform in addition we discover that mainly the positive shocks associated with an increase in oil prices have an impact upon the real effective exchange rate movements in the short and long runs

job separation in a non stationary search model a structural estimation to evaluate alternative unemployment insurance systems this paper considers a job search model in which the environment is not constant throughout the unemployment spell and where jobs do not last for ever in this situation reservation wages can be lower than they would be in a model without consideration of such separations but they can initially be higher precisely because of the non constant environment the model is estimated structurally by using spanish data for the period 1985 1996 the main finding is that after controlling for unobserved heterogeneity the unemployment hazard rate is almost flat during the first six months however after this duration the highly decreasing job offer arrival rate comes to be the only significant factor given that acceptance probabilities become equal to one the estimated parameters are used to evaluate different unemployment insurance designs we conclude that a non monotonic pattern in unemployment benefits joint with a tax paid by workers and based on unemployment duration makes this duration 13 2 lower than it currently is in spain copyright 2006 john wiley sons ltd