Which of the following factors contributed to the collapse of command economies at the end of the 20th century? a. they were undermined by the huge differences between the rich and poor they created. b. they were too focused on producing consumer goods instead of valuable new technologies. c. they were much less efficient at producing goods than western free market economies. d. they were unstable due to their reliance on constantly increasing stock prices.

C.They were much less efficient at producing goods than Western free market economies

Command economies were much inefficient due to low productivity coming from lack of innovation and lack of competition to stir innovation unlike free market economies that were highly competitive and productive

THE answer is C according to Apex.

comparative method

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john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.