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Slide 1
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This is the Real Aggregate Supply (RAS) curve. 

For Y< Yp, RAS coincides w/the 45 degree line.  (Yp is Potential GDP.)

For Y >= Yp, RAS is vertical at Yp.

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Suppose Ep0 is the initial Aggregate Expenditure line.  

Equilibrium occurs where Ep0 crosses RAS at Y0.