The price-to-earnings (PE) ratio of a company is the share price of a company divided by its earnings per share (which is reported quarterly). It is a popular measure of value. The PE of the S&P 500 is the average PE of all companies in the S&P 500 index, used as a valuation measure for the broader market. The S&P 500 PE ratio was 28.81 on September 20, 2021.
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