CAS EC 202 Lecture Notes - Lecture 14: Nominal Rigidity, Phillips Curve, Aggregate Supply

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Chapter 14: the inflation-unemployment trade-off: two models of aggregate supply in which output depends positively on the price level in the short run, the short-run tradeoff between inflation and unemployment known as the phillips curve. In previous chapters, we assumed the price level p was stuck in the short run: this implies a horizontal sras curve, now, we consider two prominent models of aggregate supply in the short run, sticky-price model. Imperfect-information model: both models imply: y = fixed y + (p-ep, other things equal, y and p are positively related, so the sras curve is upward sloping. Then, p = ep: to derive the aggregate supply curve, first find an expression for the overall price level, s = fraction of firms with sticky prices. Then, we can write the overall price level as: P = s[ep] + (1-s)[p+ (y-fixedy: subtract (1-s)p from both sides: sp = s[ep]+(1-s)[ (y-fixed y, divide both sides by s:

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