Economics 2123A/B Lecture Notes - Lecture 14: Output Gap, Investment Goods, Money Supply

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3 ) markets can be out of equilibrium in the short run: prices do not adjust in the short run. They are stuck sticky price models incorporate this idea because they claim firms will not change their prices in the short run. r* is set by the bank. Even though the markets are not clearing keynesians maintain that firms will produce all that is demanded at r*. Remember the price level is stuck so the bank must maintain the money supply that goes along with y* and r*. The economy produces the amount determined by n*-- which is consistent with y* and r*. So if the bank changes r* -- everything follows! Two key definitions: the output gap is the difference between equilibrium output (if prices were flexible) and actual output, the natural rate of interest is the equilibrium rate of interest if prices were flexible. That is the interest rate that would result in yd = ys.

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