ECN 506 Chapter Notes - Chapter 12: Phillips Curve, Problem Solving, Supply Shock

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Business cycle: short-run fluctuations in economic output gdp and unemployment u. Potential output y*: normal or average level of output resources and technology. Natural rate of unemployment u*: normal or average rate of unemployment. Natural rate (est by economics): output=potential output (worker works at normal intensity) Hysteresis: recession affects workers permanent increase natural rate. Boom: actual output y > potential output y* Recession: actual output < potential output y* Output gap= % difference between a and p: output gap= y= (y-y*)/y* Boom: unemployment u above natural rate u* Okun"s law: ( y y* )/ y* = 2( u u* ) Output gap fall 2% point unemployment rises 1 point. Aggregate expenditure: total spending on goods and services by people, firms, and governments. Y = ae = c + i + g + nx (export- import) Ex ante real interest rate: r ex ante = i - e: increase r decrease ae, affect all c, i, nx not g.

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