DAD-SAS model

The DAD-SAS model is a macroeconomic model based on the AD-AS model but that looks at the different incomes at different inflation levels.

DAD curve

The DAD (Dynamic aggregate demand) curve is in the long run a horizontal line called the EAD (Equilibrium aggregate Demand) curve. The short run DAD curve at flexible exchange rates is given by the equation:

$\pi=\mu-bY%2BbY_{-1}%2Bh(\Delta i^W%2B\Delta \epsilon^e)$

The short run DAD curve at fixed exchange rates is given by the equation:

$\pi=\epsilon%2B\pi^W-bY%2BbY_{-1}%2B\gamma \Delta Y^W%2B\delta \Delta G-f(\Delta i^W%2B\Delta \epsilon^e)$

SAS curve

The SAS (Surprise aggregate supply) curve is in the long run a vertical line called the EAS (Equilibrium aggregate Supply) curve. The short run SAS curve is given by the equation:

$\pi=\pi^e%2B\lambda(Y-Y*)$