Answer: Option D
Answer: (d)
The planned economy is based on the mixed economy system.
The concept of a mixed economy evolved from the ideas of Keynes. The concept of Mixed Economy means that both private enterprises and public enterprises coexist.
However, the condition attached is that the private enterprises must work for serving society rather than having only self-interest.
Further, private enterprises may not be allowed in every sector of the economy like area of national importance.