Top: US GDP per capita, and US median family income, in thousands of chained 2000 US dollars. (GDP from the BEA, median family income from Data 360, and population from the Census Bureau). Bottom: Percentage of persons who responded to the question "Taken all together, how would you say things are these days--would you say that you are very happy, pretty happy, or not too happy?" with each of the three options. (General Social Survey).
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