C. Lack of government intervention
John Maynard Keynes was a British economist well known for his economic theories on prolonged unemployment such as that seen during the Great Depression.
The correct answer is : He believed that the Great Depression had been caused by the lack of government interference in the economy.
Keynes was a British economist who wrote a book entitled "The general theory of employment, interest and money, where he tried to explain about the Great Depression. He argued that if the government invested more money to help the economy recover the money that consumers and businesses spend, then in this way unemployment rates would decrease.
Lack of government intervention.
John Maynard Keynes believed the government should increase demand to estimulate growth. He was a supporter of government increased spending in infrastructure, unemployment benefits and education. All of that should boost demand.