This is a correct answer to the following question about John Maynard Keynes. Yes or no?
Answer: John Maynard Keynes, 1st Baron Keynes, CB , FBA ( ; 5 June 1883 – 21 April 1946) was a British economist whose ideas have fundamentally affected the theory and practice of modern macroeconomics , and informed the economic policies of governments.
Question: what was the main contribution of john maynard keynes made to economics
