This paper renders the evolution of economic theories from classical and neoclassical specific conceptions to Keynesian and neo-Keynesian approach, underlining the arguments and contra-arguments of each side in supporting their ideas. The equilibrium on different markets in rendered according to the vision of the said thought’s adepts both graphically and by means of representative models. The article, covering a period of about of two hundred years represents in fact a brief history of the economic life of the time, reflected, with a critical eye, in a very personal manner.
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