We find that option returns are significantly lower over nontrading periods, the vast majority of which are weekends. Our evidence suggests that nontrading returns cannot be explained by risk, but are rather the result of widespread and highly persistent option mispricing driven by the incorrect...

of a higher depreciation rate, which makes inventory riskier than fixed capital. In support of this result, our empirical work documents that risk premia, rather than real interest rates, are negatively related to future inventory growth. This relation is highly significant and robust to a...

This paper discusses linear regression of strongly correlated data that arises, for example, in magnetohydrodynamic equilibrium reconstructions. We have proved that, generically, the covariance matrix of the estimated regression parameters for fixed sample size goes to zero as the correlations...