How were the Five Year Plans evidence of a command economy in the USSR?

Question- How were the Five Year Plans evidence of a command economy in the USSR?

Answer- Stalin's First Five-Year Plan, adopted by the party in 1928, called for rapid industrialization of the economy, with an emphasis on heavy industry. It set goals that were unrealistic—a 250 percent increase in overall industrial development and a 330 percent expansion in heavy industry alone.

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