He covers market efficiency, valuation, and modern portfolio theory in a book that The New York Times noted "rates high as reading for every professional investor."Brealey's easy-to-understand approach to modern investment theory will also prove invaluable to students. The book evaluates the use of technical models and fundamental analysis for common stock selection, examining the implications of the random walk hypothesis, publicly available information, and the efficient market theory. It takes up the valuation of common stocks and reasons for fluctuations in earnings and deals with the choice of a common stock portfolio, discussing how stocks move together, the effect of the market on stock prices, passive and active portfolios, risk and return, and measuring investment performance.

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