The statement that is true about money is:
Money does not provide a standard unit of measurement.
This statement is false, as money does provide a standard unit of measurement, allowing people to compare the value of different goods and services.
The other statements are also false:
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Money retains the same value permanently: This is not true as the value of money can fluctuate over time due to inflation and other economic factors.
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Money maintains purchasing power over time: Incorrect, because purchasing power can change due to inflation or deflation.
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Money stays at the same value over time: This statement is also false as money can lose or gain value over time.
Thus, in summary, none of the provided statements are true about money.