"Doing what I think of as real macroeconomics — the tradition that runs through Keynes and Hicks — actually involves thinking about interdependent markets, in a way many economists never learn to do. At minimum you have to keep straight the relationships among the markets for goods, bonds, and money; if you try to think about either interest rates or the price level in terms of just a single market — interest rates determined by supply and demand for lending, price level by quantity of money, full stop — you get it all wrong, especially in times like the present."
You can read the rest of Paul Krugman's post here.
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