Macroeconomics, as a separate branch of economics, emerged after which British economist published his book "The General Theory of Employment, Interest and Money" in 1936?

John Maynard Keynes

The correct answer is Option 1: John Maynard Keynes

Macroeconomics, as a separate branch of economics, emerged after the British economist John Maynard Keynes published his celebrated book "The General Theory of Employment, Interest and Money" in 1936.