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Statistical evidence supports this approach. Approximately 30 studies conducted in Europe and the United States from the 1930s to the present demonstrate that portfolios constructed with low market-to-book and low price-to-earnings stocks outperform the market by 3 to 5 percent annually, while portfolios with small-cap stocks outperform by 2 to 3 percent. These statistically constructed portfolios of "cheap" stocks consistently produce above-average returns across all extended time periods in all global markets—phenomena that should not be observed if markets were perfectly efficient. value investing bruce greenwald pdf