Weak-form efficiency

Definition:

A pricing theory that the price of a security reflects the past price and trading history of the security. Theory implies that security prices follow a random walk. Related: Semistrong-form efficiency, strong-form efficiency.

Investing Essentials


Copyright © 2011 Campbell R. Harvey, Professor of Finance, Fuqua School of Business at Duke University

Term of the Day

Italian Derivatives Market (IDEM)

A derivatives market operated by the Italian Stock Exchange Council. It trades futures and options on the 30 index and individual stock options. See: Italian Stock Exchange.

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