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An economist is an expert who studies the relationship between a society's resources and its production or output. Economists study societies ranging from small, local communities to entire nations and even the global economy.
John Maynard Keynes known for being the "giant economist". Advocated government spending and monetary policy to mitigate the adverse effects of recessions,depressions and booms. Another one is
Adam Smith, a Scottish philosopher turned into Political Economist. Authored Wealth of the Nations and advocated the Laisez faire policy. Also known for being the founder of macroeconomics.