A Rational Expectations Model of Time Varying Risk Premia in Commodities Futures Markets: Theory and Evidence
用时变套期保值理论建模，认为现货价格方差（波动率）影响期货风险溢价，理性预期下预期方差应纳入均衡溢价。检验四个商品市场发现方差有可预测成分，但仅一个市场中溢价与预期方差相关。
The intertemporal hedging theory is used to model the role of spot price risk, measured by the variance, in futures market risk premia. The model gives a theoretical basis for treating the variance as serially correlated when commodities are storable. T he rational expectations hypothesis implies that agents use the varianc e process to predict risk; therefore, the expected variance should be incorporated in equilibrium risk premia. Tests on data from four commodity markets show that variances do have predictable components ; however, premia are related to expected variances in only one market. Copyright 1993 by Economics Department of the University of Pennsylvania and the Osaka University Institute of Social and Economic Research Association.