Planned economy = central command economy (as opposed to market which distributes decision power to all participants)

People are competitive by nature. Central planning brings most alpha-types to the center. There they consolidate power and draw disproportionate benefits for themselves and their support groups. Ideas threatening the status quo are outlawed. Security and stability are emphasized. Large security apparatus is built to protect the state.

Eventually central planers find ways to chose & groom their successors, which usually turn to be next in kin. Gradually a narrative develops praising the elite for its unique skills & wisdom. An aristocracy is born.