<human>:  Why did the Soviet Union collapse?
<bot>: The Soviet Union collapsed because of the failure of the centrally planned economy. It is widely accepted that the Soviet Union’s economic policies led to a decline in the quality of life for its citizens, and the Soviet Union’s failure to reform its economy led to a series of economic crises. The Soviet Union’s economy was highly centralized, and the government controlled almost all aspects of the economy. As a result, the Soviet Union’s economy was not efficient, and its citizens were unable to buy the goods and services they needed.