Final answer:
John Maynard Keynes, a famous economist, suggested that "The production problem has been solved". He believed in increased government intervention in the economy during challenging financial times.
Step-by-step explanation:
The famous economist who suggested that "The production problem has been solved" is John Maynard Keynes. Keynes was a British economist known for his influential theories on macroeconomics. In his book The General Theory of Employment, Interest, and Money, Keynes argued for increased government intervention in the economy during times of recession or depression. His ideas changed people's thinking about the role of government in stabilizing the economy.