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We have surveyed in this article the development of the Keynesian macroeconomic system since 1936 up to the present. Our approach was, however, analytical rather than historical and descriptive. Keynesian System, hence Neo-Keynesians and modern Keynesian schools, such as New Keynesian Economics and Post-Keynesian Economics visualize that, if left by itself, the economy will give unemployment due to insufficiency of aggregate demand. In the article, the Keynesian policies are analysed with respect to their efficiency. Keynesian System was developed and modified in the face of criticisms by its opponents. We emphasize in our article that the Keynesian System was mainstream most of the time both in academic circles and in implementation. Presently again, basically Keynesian System has the upper hand, mostly New Keynesian Economics and also to some extent, Post-Keynesian Economics.The last section of the article covers an evaluation of what Keynes might have said for today’s economic problems.

Keynesian System, Keynesian Policies and an Evaluation of What Keynes Might Have Advised Today