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[–]ActuallyNot 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 2 fun -  (2 children)

It's the proxy that economists use to compare standard of living.

[–]Jiminy 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

Why use that

[–]ActuallyNot 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Because it can be measured, and it's related.