Economist and columnist Paul Krugman advises us to think in terms of models. One of the simple and important models for Keynesian economists is the IS-LM model. CIP began a discussion of it. Fortunately, it is simple enough to understand, there is an excellent exposition here. The four youtube videos take just under a half-hour to watch, but after that you are equipped to think about the economy in terms of this simple model.
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