Final answer:
In a closed economy, 'net exports' is the component of GDP that is not included as it does not engage in international trade.
Step-by-step explanation:
In a closed economy, the component of GDP that is not included is net exports. Gross Domestic Product (GDP) in a closed economy is calculated using three main components: consumption, business investment, and government spending on goods and services. Since a closed economy does not engage in international trade, it does not have exports or imports, making net exports, which are the difference between a country's total exports and total imports, irrelevant to its GDP measurement.