Over the past 100 years, U.S. real GDP per person has doubled about every 35 years. If it continues to double every 35 years, then in 100 years U.S. real GDP per person will be about

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If U.S. real GDP per person doubles every 35 years, in 100 years it will double approximately 3 times (since 100/35 is about 2.86, which rounds to 3). Doubling 3 times results in 2^3 = 8 times higher.

Over the Past 100 Years, U