Step 1: Understanding the functions of money.
Money performs several important functions in an economy. It acts as a medium of exchange, a store of value, and a measure of value (unit of account).
Step 2: Identifying the incorrect option.
Money itself does not measure economic activity. Economic activity is measured by indicators such as GDP.
Step 3: Analysis of the options.
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(A) A store of value: Correct function of money.
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(B) A measure of economic activity: Incorrect. Not a direct function of money.
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(C) A medium of exchange: Correct function.
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(D) A measure of value: Correct function.
Step 4: Conclusion.
Therefore, “a measure of economic activity” is not a function of money.
Final Answer:} A measure of economic activity.