Joel Greenblatt defines the earnings yield using the above equation because it more accurately reflects the companys profitability relative to its stock price. Items like interest payment and tax etc. are not directly related to the companys operational profitability.
Enterprise Value instead of market cap (share price) is used in the calculation because it is the real price stock and bond investors together pay for the company.
Joel Greenblatts definition of earnings yield has the same problems the regular earnings yield does. It does not consider the growth of the company. It only looks at one-years business operation. For cyclical companies, the earnings yield is usually highest at the peak of the business cycle. But these earnings are rarely sustainable.
Forward Rate of Return based on Don Yacktmans definition is a better measure of the expected rate of return for a stock.
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