Great insight. A similar thing happens elsewhere in the economy. Alice wants to work, but has a baby. If she get a job, she has to hire a baby sitter, and a maid to clean her house. Suddenly, GDP of the economy grows by 2x. (When Sally cleans here own house this is not economic production.) Some world event happens and the price of gas goes from $2 for $4 a gallon. Suddenly, the sales of every gas station goes up. Demand for houses in California rises because of low interest rates, now every house is suddenly "worth" twice as much.
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