We study the behavior of the optimal portfolio policy of a long-run investor in markets with stationary investment opportunity sets. We provide conditions on the utility function, for large wealth levels, which are sufficient for the optimal portfolio policy to approximate, as the trading...

A restriction to nonnegative wealth is sufficient to preclude all arbitrage opportunities in financial models that have risk neutral probabilities that are valid for all simple strategies. Imposing nonnegative wealth does not constrain agents from making the choice they would make under the...

The market for Treasury securities attracted considerable attention recently, after alleged infringements by Salomon Brothers. Several questions have been raised about the best way of selling U.S. government debt. One issue is whether altering the auction format would yield greater revenues for...