In comparing GDP data over a period of years a difference between GDP and real GDP may arise because

A) Of changes in our trade deficits and surpluses.
B) The length of the workweek has declined historically.
C) The price level may change over time.
D) Depreciation may be greater or smaller than gross investment.

Trade Deficits

A situation where a country's imports of goods and services exceed its exports, resulting in a net outflow of domestic currency to foreign markets.

Real GDP

Gross Domestic Product adjusted for inflation, which reflects the value of all goods and services produced by an economy in a given year in base-year prices.

Price Level

The average price point of the entirety of goods and services in the economic scope.