Concept:A mixed economy is one where both the government and private individuals take part in productive activities.
Explanation:In a mixed economy, the public sector and the private sector operate side by side.
The government controls certain enterprises and provides essential services.
Private individuals and firms also own and manage businesses in the economy.
Because both sectors contribute to production and investment, they jointly promote economic growth.
This distinguishes it from a capitalist economy, which relies mainly on private enterprise, or a socialist economy, which relies mainly on state control.
Answer:D. mixed economy