The book which is at the centrepiece of the study of Macro - Economics was written by - (1) Prof. Samuelson (2) Prof. J.M. Keynes (3) Prof. Benham (4) Prof. Baumol
(2) Prof. J.M. Keynes Explanation: J.M. Keynes's magnum opus, The General Theory of Employment, Interest and Money' is often viewed as the foundation of modern macroeconomics. Macroeconomics deals with the performance, structure, behavior, and decision-making of an economy as a whole, rather than individual markets.