forecasting crude oil price volatility and value at risk evidence from historical and recent data abstract this paper adopts the markov switching multifractal msm model and a battery of generalized autoregressive conditional heteroscedasticity garch type models to model and forecast oil price volatility extending previous work by wei et al 2010 and wang et al 2016 we evaluate the forecasting performance of all these models via a superior predictive ability spa test we go beyond previous research by i considering oil price volatility in the nineteenth century along with recent data ii applying different types of msm models and iii considering value at risk predictions besides our forecasting of volatility confirming its successful performance in other studies the new msm model comes out as the model that most often across forecasting horizons and subsamples cannot be outperformed by other models this superiority also applies to forecasting of value at risk

reassessing the empirical relationship between the oil price and the dollar abstract this paper aims at reassessing the empirical relationship between the real price of oil and the u s dollar real effective exchange rate over the 1974 2015 period we find that changes in both variables are now linked by a negative relationship going from the dollar exchange rate to the real oil price however the same relationship is found positive when ending the sample in the mid 2000s in line with the previous literature to understand and investigate this evolution we rely on a nonlinear smooth transition regression model in which the oil price dollar nexus depends on the dynamics followed by the u s currency our results show that the relationship is negative most of the times but turns positive when the dollar hits very high values as in the early eighties

a time varying copula approach to oil and stock market dependence the case of transition economies abstract we employ the time varying copula approach to investigate the conditional dependence between the brent crude oil price and stock markets in the central and eastern european cee transition economies our results show evidence of a positive dependence between the oil and the stock markets of the six cee countries which is indicative of a contagion between those markets regardless of the changes in the oil price or the cee stock index moreover the dependence patterns in both the center and left tails of the return distributions change over time particularly during the heart of the financial crisis and are best described by the survival gumbel copulas the empirical evidence also suggests that the lower tail dependence is much stronger than that of the upper tail highlighting the importance of contagion during severe contractionary business cycles among the sample markets poland is shown to be particularly sensitive in this regard while hungary and slovenia are the least sensitive

measuring contagion between energy market and stock market during financial crisis a copula approach abstract in this paper we apply time varying copulas to investigate whether a contagion effect existed between energy and stock markets during the recent financial crisis using the wti oil spot price the s p500 index the shanghai stock market composite index and the shenzhen stock market component index returns evidence was found for a significantly increasing dependence between crude oil and stock markets after the failure of lehman brothers thus supporting the existence of contagion in the sense of forbes and rigobon s 2002 definition moreover increased tail dependence and symmetry characterize all the paired markets this indicates that significant increases in tail dependence are an actual dimension of the contagion phenomenon and that crude oil and stock prices are linked to the same degree regardless of whether markets are booming or crashing during the sample period finally the contagion effect is found to be much weaker for china than the us the empirical results have potentially important implications for risk management

index investment and financialization of commodities the authors found that concurrent with the rapidly growing index investment in commodity markets since the early 2000s prices of non energy commodity futures in the united states have become incr

trading horizons and the value of money abstract this paper shows that fiat money can be feasible and essential even if the trading horizon is finite and deterministic the result hinges on two features of our model first individual actions can affect the future availability of productive resources so agents may be willing to sell for money even if on that date they have no reason to accept it this makes monetary trade feasible in all preceding dates second agents are anonymous and direct their search for partners so gift giving arrangements may be prevented because agents can misrepresent their consumption needs this makes money essential in exploiting any gains from specialization and trade

an equilibrium politico economic model an equilibrium politico economic model i introduction recent empirical studies by alesina and sachs 1986 and haynes and stone 1987 have found that political elections have significant implications for the time paths of employment and inflation explnations of this phenomenon fall into two general categories political business cycle theories and partisan theories in political business cycle models it is assumed that the government has both the ability and desire to manipulate the economy for electoral purposes partisan theories suggest that if competing parties follow different policies it is the surprise of an election result that causes a response from the economy however partisan theories can only explain why different parties experience different levels of employment and output early in an electoral term here a partisan model is developed in which economic and political shocks before an election have asymmetric effects on inflation employment and voting behavior depending on which party is in power and which economic variables effect voting ii political structure and voting two political parties compete periodically for control of the government the parties are distinguished by their expected monetary growth rates denoted mu sup h high and mu sup l low the electorate consists of a continuum of voters distributed uniformly on the interval p p individuals located closer to p are more favorably pre disposed to party h let x sub t be an index of the relative popularity of the parties at time t if x sub t 0 party h has a plurality of support if x sub t in nonelection years the expected monetary growth rate will be the incumbents trend rate while in election years it will be the probabilistically weighted average of the two parties expected monetary growth rates iii economic structure the economy is described by a rational expectations macro model unemployment is determined by the surprise phillips curve u sub t eta sub 0 eta sub 1 sub t 1 pi sup e sub t pi sub t epsilon sub t where sub t 1 pi sup e sub t denotes expected inflation and epsilon sub t a real shock distributed epsilon sub t is approx n 0 sigma sup 2 sub epsilon independent over time eta sub 0 is greater than 0 and eta sub 1 is greater than 0 are constants eta sub 0 is the natural rate the rate of inflation is given by pi sub t mu sup s sub t mu sup d sub t where mu sup s sub t and mu sup d sub t are respectively the growth rates of the nominal money supply and demand for real beginning of period cash balances

volatility spillovers between oil prices and stock sector returns implications for portfolio management abstract in this article we take a recent generalized var garch approach to examine the extent of volatility transmission between oil and stock markets in europe and the united states at the sector level the empirical model is advantageous in that it typically allows simultaneous shock transmission in the conditional returns and volatilities insofar as volatility transmission across oil and stock sector markets is a crucial element for portfolio designs and risk management we also analyze the optimal weights and hedge ratios for oil stock portfolio holdings with respect to the results our findings point to the existence of significant volatility spillover between oil and sector stock returns however the spillover is usually unidirectional from oil markets to stock markets in europe but bidirectional in the united states our back testing procedures finally suggest that taking the cross market volatility spillovers estimated from the var garch models often leads to diversification benefits and hedging effectiveness better than those of commonly used multivariate volatility models such as the ccc garch of bollerslev 1990 the diagonal bekk garch of engle and kroner 1995 and the dcc garch of engle 2002

stabilization theory and policy 50 years after the phillips curve this paper discusses the impact of a w h phillips seminal work in macroeconomic stabilization policy on subsequent developments in that field we begin by reviewing the various stabilization rules adopted by phillips and show how these relate to optimal stabilization rules that emerge from linear quadratic optimization problems most of the early st abilization literature was associated with backward looking variables the development of rational expectations in the 1960 s and 1970 s posed a challenge for stabilization policy this arose from the role of forward looking inflationary expectations in the phillips curve and the effect this had on the design of optimal stabilization rules through issues such as the lucas critique and the time consistency of policy we also briefly comment on a long standing debate pertaining to the merits of fixed policy rules versus discretionary or optimal policy the latter part of the paper discusses some of the more contemporary aspects of stabilization policy thereby serving to illustrate the durability of phillips contributions

should investors include commodities in their portfolios after all new evidence abstract this paper investigates whether an investor is made better off by including commodities in a portfolio that consists of traditional asset classes first we revisit the posed question within an in sample setting by employing mean variance and non mean variance spanning tests then we form optimal portfolios by taking into account the higher order moments of the portfolio returns distribution and evaluate their out of sample performance under the in sample setting we find that commodities are beneficial only to non mean variance investors however these benefits are not preserved out of sample our findings challenge the alleged diversification benefits of commodities and are robust across a number of performance evaluation measures utility functions and datasets the results hold even when transaction costs are considered and across various sub periods not surprisingly the only exception appears over the 2005 2008 unprecedented commodity boom period

index investment and the financialization of commodities the authors found that concurrent with the rapidly growing index investment in commodity markets since the early 2000s prices of non energy commodity futures in the united states have become increasingly correlated with oil prices this trend has been significantly more pronounced for commodities in two popular commodity indices this finding reflects the financialization of the commodity markets and helps explain the large increase in the price volatility of non energy commodities around 2008

disposable income unemployment inflation and state spending in a dynamic political economic model this paper formulates a medium term macroeconomic model of disposable income unemployment inflation and state spending proposes a theory of qualitative choice to explain electoral popularity in terms of these variables and develops three approaches to the formulation of political economic policy the first approach is static sets the tax rate to reconcile the interests of various pressure groups and yields a political trade off between the private and public sector the second approach relies on maximizing the probability of winning the next election and gives rise to a political business cycle unless the electorate votes strategically the implications of crowding out of private investment under alternative monetary rules autonomous behaviour of the state bureaucracy and tax indexation for the political business cycle are also examined the third approach analyzes the objective of maximizing the uninterrupted length in office it yields a short run political cycle superimposed on a longer cycle

the optimal intertemporal choice of inflation and unemployment an analysis of the steady state and transitional dynamics abstract this paper analyzes the optimal intertemporal choice of inflation and unemployment rates in two versions of a simple dynamic macro model in the first of these the real wage remains fixed while in the second the real wage is permitted to adjust endogenously the implications for the long run as well as the transitional dynamic adjustment paths are discussed in detail in the long run the optimal policy will drive the economy to its natural rate of unemployment accompanied by a steady rate of inflation which can be described in terms of a number of parameters characterizing the economy and the preferences of the policy maker the transitional dynamic adjustment path also depends upon these parameters among which the rate of time discount is particularly important

wti crude oil futures in portfolio diversification the time to maturity effect the aim of the paper is to analyze the diversification effect brought by crude oil futures contracts the most liquid commodity futures into a portfolio of stocks the studies that have documented the very low and essentially negative correlations between commodities and equities typically rely on normally distributed returns which is not the case for crude oil futures and stocks indexes moreover the particular time to maturity chosen for the future contract used as an investment vehicle is an important matter that needs to be addressed in presence of forward curves switching between backwardation and contango shapes our goal in this paper is twofold a we introduce copula functions to have a better representation of the dependence structure of oil futures with equity indexes b using this copula representation we are able to analyze in a precise manner the maturity effect in the choice of crude oil future contract with respect to its diversification benefits our finding is that in the case of distant maturities futures e g 18 months the negative correlation effect is more pronounced whether stock prices increase or decrease this property has the merit to avoid the hurdles of a frequent roll over while being quite desirable in the current trendless equity markets empirical evidence is exhibited on a database comprising the nymex wti crude oil futures and s p 500 index over a 15 year time period

search evolution and money abstract this paper describes a search theoretic model that can be used to determine which objects serve as media of exchange or money existing versions of the model are generalized to allow arbitrary distributions of agents who specialize in different consumption production activities i characterize the way the numbers of consumers and producers of the various goods help determine which goods serve as money the distribution is then endogenized so that agents can choose their type this generates a unique equilibrium outcome ideas from evolutionary dynamics are employed as a way to interpret the model and to compute equilibria

a finite horizon monetary economy abstract conventional wisdom says that there is no demand for money in an economy of finite duration in this article we show that this is not necessarily the case we use a random matching model in which the function of money is to mediate exchange by alleviating the double coincidence of wants problem towards the end economic activity decreases but this does not affect the ability of money to speed up trade

fiat exchange in finite economies the state of the art of rendering fiat money valuable is either to impose a boundary condition or to make the boundary condition unimportant through an infinite sequence of markets so as to circumvent backward induction we show fiat exchange may nevertheless arise in finite economies if agents have incomplete information about their relative position in the trade cycle or when the barter and autarky equilibria of the one shot trading round support a monetary equilibrium with repeated trades

testing the satisficing version of the political business cycle 1905 1984 this paper develops a test of the satisficing version of the political business cycle previous tests have focused on maximizing models of political behavior and are not sufficiently general to test for satisficing behavior using annual u s data for the period 1905 to 1984 we find evidence supporting the satisficing version of the political business cycle model but we reject the maximizing version in accordance with the satisficing hypothesis we find that increasing inflation or unemployment and decreasing monetary base growth in the third year of a presidential term are followed typically by reversals during the election year

the political theory of the business cycle two strands of recent empirical work pose a challenge for the macro theorist when brought together one is the rational expectations interpretation of the business cycle the other is the political theory of the business cycle this paper attempts a reconciliation of these two strands in a theory where national political parties have to satisfy the preference of their own supporters as well as the floating voter the implications are that party voters evaluate government performance with respect to expected inflation and output and their variances and that parties will pursue different feedback rules

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

sources of production inefficiency and productivity growth in china a global data envelopment analysis abstract the current mode of production in china is extensive and inefficient and has caused great stress on both resources and the environment this paper focuses on analyzing the sources of production inefficiency and productivity growth in china here a developed slacks based measure is utilized to decompose production inefficiency into three components input inefficiency economic output inefficiency and environmental inefficiency furthermore by applying a method based on global data envelopment analysis we take a further step to analyze the key factors responsible for the change of environmental productivity during 2003 2011 from the point of view of technical progress productive scale and management level the results show that redundancy in energy and labor inputs and excessive emission of sulfur dioxide chemical oxygen demand and ammonia nitrogen are the main sources of production inefficiency in china during the sample period the efficiency in all inputs and environmental emissions has improved except for capital input efficiency which had a decreasing trend further analysis shows that the overall environmental productivity in china has begun to follow an ascending path technical progress is the most powerful contributor to china s productivity growth while the decreases in scale and management efficiency are the two main obstacles preventing productivity improvement

oil price fluctuations and u s dollar exchange rates adding oil prices to the monetary model of exchange rates we find that oil prices significantly explain movements in the value of the u s dollar usd against major currencies from the 1970s to 2008 our long run and forecasting results are remarkably consistent with an oil exchange rate relationship increases in real oil prices lead to a significant depreciation of the usd against net oil exporter currencies such as canada mexico and russia on the other hand the currencies of oil importers such as japan depreciate relative to the usd when the real oil price goes up

are oil shocks inflationary asymmetric and nonlinear specifications versus changes in regime this paper identifies a structural break in core u s inflation phillips curves such that oil prices contributed substantially before 1981 but since that time pass through has been negligible this characterization is robust to a variety of re specifications and fits the data better than asymmetric and nonlinear oil price alternatives evidence does not support the hypotheses that declining energy intensity or deregulation of energy producing and consuming industries played an important role monetary policy did not itself become less accommodative of oil shocks but may have helped create a regime where inflation is less sensitive to price shocks more generally

nonconcavity and proper optimal periodic control this paper deals with optimal periodic control problems in an economic context the main result is that nonconcavity is necessary for proper periodicity of optimal solution paths the theoretical results are illustrated by an unemployment and inflation trade off model

on political business cycles with endogenous election dates abstract the pattern of policy generated cycles which result in the nordhaus model is examined under different hypotheses regarding election date determination

optimal monetary policy in an open economy this paper analyzes the optimal intertemporal tradeoff between inflation and output in an open economy under perfect foresight the announcement of the optimal plan may or may not generate an initial jump in the exchange rate that depends upon the real adjustment costs which such unanticipated changes impose on the economy in the case that such jumps occur the question of time consistency of the optimal policy arises a time consistent solution is obtained provided i the policy maker is not too myopic ii the adjustment costs associated with the jump in the exchange rate are of an appropriate form the optimal monetary rule is derived and properties of this rule as well as the overall optimal adjustment of the economy are discussed

the political business cycle under rational voting behavior this essay argues that politically motivated business cycles could persist in a democratic society even if the electorate votes in a rational fully informed manner provided that government policymakers have the means to systematically generate macroeconomic fluctuations this cyclic outcome reflects the preferences of an electorate that is composed of imperfectly altruistic voters belonging to different overlapping generations since each generation has a different horizon over which it would like to have elected politicians provide an optimal economic policy plan an intergenerational conflict of interests situation arises this conflict is placed into an explicit political context whereby cycles become generated under the institutional constraint of periodic elections

on the dynamic links between commodities and islamic equity abstract this paper investigates whether commodities offer potential diversification benefits for islamic equity index investors in light of possible financialization of commodity markets using mgarch dcc and wavelet coherence analyses our findings reveal that correlations between commodity markets and the dow jones islamic market world index are time varying and highly volatile throughout the january 1999 april 2015 period a substantial and persistent increase was observed in the return correlations between commodities and islamic equity at the onset of the 2008 financial crisis however trends in the recent two years suggest that this association is heading towards its pre crisis levels offering again diversification benefits for islamic equity holders these benefits vary across different commodities in various time scales overall gold natural gas soft commodities grains and livestock are better portfolio diversifiers than oil and other metals relative to medium to long term investors short term investors less than 32 days horizon gained better diversification benefits in most commodities during bullish bearish and market recovery periods these findings have implications for investors who are heterogeneous in risk tolerance and time preference as well as for policymakers who are concerned with market stability

dynamic speculation and hedging in commodity futures markets with a stochastic convenience yield the main objective of this paper is to address in an a continuous time framework the issue of using storable commodity futures as vehicles for hedging purposes when in particular the convenience yield as well as the market prices of risk evolve randomly over time following the martingale route and by operating a suitable constant relative risk aversion utility function crra specific change of numeraire we solve the investor s dynamic optimization program to obtain quasi analytical solutions for optimal demands which can be expressed in terms of two discount bonds traded and synthetic contrary to the existing literature we explicitly derive the individual optimal proportions invested in the spot commodity in a discount bond and in the futures contracts which can be computed in a simple recursive way we suggest various decompositions allowing an investor to assess the sensitivity of the optimal demands to the state variables and to specify the role played by each risky asset empirical evidence shows that the convenience yield has a strong impact on the speculation and hedging positions and the interaction among time varying risk premia determines the magnitude and the sign of these positions

commodity prices interest rates and the dollar this paper sheds light on recent fluctuations in commodity prices we investigate whether a decline in real interest rates and the us dollar contributes to higher commodity prices and whether commodity prices display overshooting behavior in response to changes in real interest rates we analyze the behavior of real prices of crude oil food metals and industrial raw materials the analysis is based on structural var models estimated on quarterly data over the period 1990q1 2007q4 our results suggest that commodity prices increase significantly in response to reductions in real interest rates moreover oil prices and prices of industrial raw materials tend to display overshooting behavior in response to such interest rate changes the evidence also suggests that a weaker dollar leads to higher commodity prices shocks to interest rates and the dollar are found to account for substantial shares of fluctuations in commodity prices

dependence structure and risk measure understanding the relationships among multivariate assets would help one greatly about how best to position one s investments and enhance one s financial risk protection we present a new method to model parametrically the dependence structure of stock index returns through a continuous distribution function which links an n dimensional density to its one dimensional margins the resulting multivariate model could be used in a wide range of financial applications focusing on risk management we show that a misspecification of the dependence structure introduces on average an error in value at risk estimates

a contribution to the pure theory of money abstract this article analyzes a general equilibrium model with search frictions and differentiated commodities because of the many differentiated commodities barter is difficult in that it requires a double coincidence of wants and this provides a medium of exchange role for fiat currency we prove the existence of equilibrium with valued fiat money and show it is robust to certain changes in the environment rate of return dominance liquidity and the welfare implications of fiat money are discussed

the congress and fiscal policy although the common belief is that the congress has paid little attention to fiscal policy the same kinds of political economic models which have been used to explain presidential budgetary policy may be used equally well to explain congressional budgetary behavior the congress fiscal policy appears to be systematically sensitive to both economic and political factors changes in the unemployment rate have a major impact on congressional budgetary policy as for political factors the president s lead is followed most closely on revenue proposals and not at all on the expenditure side the electoral cycle in particular the off year congressional election year is also important inducing larger deficits and smaller increases in revenues

structural vector autoregressions with nonnormal residuals in structural vector autoregressive svar modeling sometimes the identifying restrictions are insufficient for a unique specification of all shocks in this paper it is pointed out that specific distributional assumptions can help in identifying the structural shocks in particular a mixture of normal distributions is considered as a possible model that can be used in this context our model setup enables us to test restrictions which are just identifying in a standard svar framework the results are illustrated using a u s macro data set and a system of u s and european interest rates

are benefits from oil stocks diversification gone new evidence from a dynamic copula and high frequency data abstract oil is perceived as a good diversification tool for stock markets to fully understand this potential we propose a new empirical methodology that combines generalized autoregressive score copula functions with high frequency data and allows us to capture and forecast the conditional time varying joint distribution of the oil stocks pair accurately our realized garch with time varying copula yields statistically better forecasts of the dependence and quantiles of the distribution relative to competing models employing a recently proposed conditional diversification benefits measure that considers higher order moments and nonlinear dependence from tail events we document decreasing benefits from diversification over the past ten years the diversification benefits implied by our empirical model are moreover strongly varied over time these findings have important implications for asset allocation as the benefits of including oil in stock portfolios may not be as large as perceived

precious metals oil and the exchange rate contemporaneous spillovers abstractwe investigate the contemporaneous spillovers among precious metals crude oil and the us exchange rate we contend that conventional reduced form vector autoregressive var models based on lead lag relations do not fully capture the interactions among these series as these models ignore the contemporaneous effects using a structural var model we identify these contemporaneous spillovers which are shown to be strong and asymmetric we further show that not taking into consideration the contemporaneous interactions among these assets leads to inaccurate findings and inevitably to inaccurate interpretations of the causal relations among them

economic linkages across commodity futures hedging and trading implications we investigate cross market trading dynamics in futures contracts written on seemingly unrelated commodities that are consumed by a common industry on the tokyo commodity exchange we find such evidence in natural rubber nr palladium pa and gasoline ga futures markets the automobile industry is responsible for more than 50 of global demand for each of these commodities var estimation reveals short run cross market interaction between nr and ga and from nr to pa cross market influence exerted by pa is felt in longer dynamics with pa volatility volume affecting nr ga volume volatility our findings are robust to lag specification volatility measure and consistent with full bekk garch estimation results further analysis which benchmarks against silver futures market tocom index and topix transportation index confirms that our results are driven by a common industry exposure and not a commodity market factor a simple trading rule that incorporates short run ga and long run pa dynamics to predict nr return yields positive economic profit our study offers new insights into how commodity and equity markets relate at an industry level and implications for multi commodity hedging

diversifying away the risk of war and cross border political crisis this paper investigates the behavior of crude oil prices government bonds and stock market indices around outbreaks of severe international crises and wars using a constant mean return event study we show that these events are associated with positive and significant abnormal returns on oil and bonds which means that these two asset classes can potentially shelter shareholders from plummeting equity values during international crises a formal safe haven analysis confirms this insight such price movements may reflect a reallocation of funds across asset classes in response to the events as well as shifts in the demand for oil due to precautionary speculative and military motives we also calculate the weights for optimal portfolios which could provide insurance against conflict risk

non gaussian diversification when size matters abstract classical portfolio theory informs investors that they should have a large number of assets in their portfolios in order to diversify risk we show that the non gaussian features of stock return distribution may not allow for this risk protection in times of crisis moreover we demonstrate empirically that if investors are risk averse and consider higher order moments they have numerous incentives not to diversify their portfolios fully this is caused by the evolution of both large losses and asymmetry of returns when the numbers of assets in a portfolio change