Macroeconomics as a separate branch came to be studied after thecontributions of which economist?
a) Adam Smith
b) John Maynard Keynes
c) F. Hayek
d) Samuelson
b) John Maynard Keynes
John Maynard Keynes's 1936 book, 'The General Theory of Employment, Interest,
and Money' laid the foundations for Macroeconomics