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Punch cards and dollar bills
The size of a punch card was standardized to be the size of US bank notes at the time. Since then the dollar has shrunk, literally and figuratively.
Today I learned that the size and shape of a punch card Thinking about how US bank notes shrank in size made me think about how they shrank in purchasing power as measured by the Consumer Price Index. Curiously, the ratio of purchasing power to area in 1940 almost returned to what it had been in the 1800s.
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