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Select the statement that best describes money's function as a standard of deferred payment.

a. The purchasing power of a currency is relatively stable over time
b. A currency is widely accepted in exchange for goods and services and therefore makes economic transactions easier.
c. A currency can be used to express the value goods and services that are both relatively expensive and goods and services that are relatively cheap.
d. People are willing to accept a currency in the future as compensation for debts accrued earlier