A trading strategy which attempts to alter the nature of price changes in a portfolio to substantially reduce the likelihood of returns below some predetermined level for an established period of time. This can be achieved by moving assets among stocks, cash and fixed-income securities or, with the advent of stock index futures contracts, by hedging a stock-only portfolio by selling stock index futures in a declining market or purchasing futures in a rising market. The objective is to create an exposure similar to that of a stock portfolio with a protective purchased put option.