The Annals of Probability

Asymptotic Optimality and Asymptotic Equipartition Properties of Log-Optimum Investment

Abstract

We ask how an investor (with knowledge of the past) should distribute his funds over various investment opportunities to maximize the growth rate of his compounded capital. Breiman (1961) answered this question when the stock returns for successive periods are independent, identically distributed random vectors. We prove that maximizing conditionally expected log return given currently available information at each stage is asymptotically optimum, with no restrictions on the distribution of the market process. If the market is stationary ergodic, then the maximum capital growth rate is shown to be a constant almost surely equal to the maximum expected log return given the infinite past. Indeed, log-optimum investment policies that at time $n$ look at the $n$-past are sandwiched in asymptotic growth rate between policies that look at only the $k$-past and those that look at the infinite past, and the sandwich closes as $k \rightarrow \infty$.

Article information

Source
Ann. Probab., Volume 16, Number 2 (1988), 876-898.

Dates
First available in Project Euclid: 19 April 2007

https://projecteuclid.org/euclid.aop/1176991793

Digital Object Identifier
doi:10.1214/aop/1176991793

Mathematical Reviews number (MathSciNet)
MR929084

Zentralblatt MATH identifier
0642.90016

JSTOR