We construct a panel of S&P 500 index call and put option portfolios, daily adjusted to maintain targeted maturity, moneyness, and unit market beta, and test multi-factor pricing models. The standard linear factor methodology is applicable because the monthly portfolio returns have low skewness...

We document that the implied volatility skew of S&P 500 index puts is non-decreasing in the disaster index and risk-neutral variance, contrary to the implications of a broad class of no-arbitrage models. The key to the puzzle lies in recognizing that, as the disaster risk increases, customers...

A continuous time model of cash management is formulated with stochastic demand and allowing for positive and negative cash balances. The form of the optimal policy is assumed to be of a simple form (d, D, U, u). The parameters of the optimal policy are explicitly evaluated and the properties of...

Kamin's theorem [Kamin, Jules H. 1975. Optimal portfolio revision with a proportional transaction cost. Management Sci. 21 (11, July).] on portfolio revision with proportional transaction costs is extended to allow for hyperbolic absolute risk averse investors and for the possibility of...