What was the question for this implicit rationale, and corresponding answer?
The relevant information is: In a centrally planned economy the allocation of resources is determined by a comprehensive plan of production which specifies output requirements.
The answer: plan of production which specifies output requirements
The question: The level of centralization in decision-making in planning depends on the specific type of planning mechanism employed. As such, one can distinguish between centralized planning and decentralized planning. An economy primarily based on central planning is referred to as a planned economy. In a centrally planned economy the allocation of resources is determined by a comprehensive plan of production which specifies output requirements. Planning may also take the form of directive planning or indicative planning.

Answer this question: a centrally planned economy most often refers to an economic system that is under comprehensive?