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John Maynard Keynes's 1936 General Theory of Employment, Interest and Money is a perfect example of the global power of critical thinking. A radical reconsideration of some of the founding principles and accepted axioms of classical economics at the time, it provoked a revolution in economic thought and government economic policies across the world. Unsurprisingly, Keynes's closely argued refutation of the then accepted grounds of economics employs all the key critical thinking skills: analysing and evaluating the old theories and their weaknesses; interpreting and clarifying his own fundamental terms and ideas; problem solving; and using creative thinking to go beyond the old economic theories. Perhaps above all, however, the General Theory is a masterclass in problem solving.

Good problem solvers identify their problem, offer a methodology for solving it, and suggest solutions. For Keynes the problem was both real and theoretical: unemployment. A major issue for governments during the Great Depression, unemployment was also a problem for classical economics. In classical economics, theoretically, unemployment would always disappear. Keynes offered both an explanation of why this was not the case in practice, and a range of solutions that could be implemented through government monetary policy.