For that indicator, The World Bank provides data for the USA from 1980 to 2018. The average value for the USA during that period was 11998.58 billion U.S. dollars with a minumum of 1263.56 billion U.S. dollars in 1981 and a maximum of 32120.7 billion U.S. dollars in 2017.
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Definition: Market capitalization (also known as market value) is the share price times the number of shares outstanding (including their several classes) for listed domestic companies. Investment funds, unit trusts, and companies whose only business goal is to hold shares of other listed companies are excluded. Data are end of year values.