Random Walk

This Issue in United States

Concept of Random Walk in Futures Trading

In this context of financial law, the following is a definition of Random Walk: An economic theory that market price movements move randomly. This assumes an efficient market. The theory also assumes that new information comes to the market randomly. Together, the two assumptions imply that market prices move randomly as new information is incorporated into market prices. The theory implies that the best predictor of future prices is the current price, and that past prices are not a reliable indicator of future prices. If the random walk theory is correct, technical analysis cannot work.