Types of market efficiency The weak-form of efficiency: price accurately reflect all information that can be derived by examining market trading data such as past prices trading volume short Interest rate. etc The semi-strong form of efficiency: prices accurately reflect all public available information, including past prices. fundamental data on the firms product line quality of management, balance sheet composition, patents held, earning forecasts, accounting practice, etc The strong-form of efficiency: prices accurately reflect all information that is known by any one, including inside InformationTypes of market efficiency • The weak-form of efficiency: price accurately reflect all information that can be derived by examining market trading data such as past prices, trading volume, short interest rate, etc. • The semi-strong form of efficiency: prices accurately reflect all public available information, including past prices, fundamental data on the firm’s product line, quality of management, balance sheet composition, patents held, earning forecasts, accounting practice, etc. • The strong-form of efficiency: prices accurately reflect all information that is known by any one, including inside information