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Show me what that math looks like where there is a positive number to the left of the equal sign.

Here it is in graph form:

Comparing eras doesn't seem very useful. 90 years ago my grandma got one orange as a present once a year. Today people buy bags of oranges every day.

Day-by-day the world is zero sum.

In order to get from "one orange as a present once a year" to "bags of oranges every day" each day has to (on average) see a small amount of growth.