Weak form market efficiency is a concept that suggests past stock prices and trading volumes do not predict future stock prices. In a weak form efficient market, all historical information is already ...

The idea that market prices reflect the latest data and information available to the public is known as price efficiency. Price efficiency refers to the idea that the price of a security or asset is ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Amanda Bellucco-Chatham is an editor, writer ...