GDP measures the value of all the final products and services in terms of money. Option C) explains the behavior of GDP.
Gross domestic product (GDP) measures the value of all the final products and services in terms of money, produced by countries over a given time period usually a year.
The behavior of real GDP over time changes but follows a downward sloping trend line if a country is sustaining a healthy rate of growth.
Therefore option C) describe the behavior of GDP.
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