$4.$ Impact on Equilibrium GDP $(8$ points$)$

For each situation listed below, state whether the change will cause U$.$S$.$ aggregate expenditures, and therefore equilibrium GDP$,$ to increase or decrease and explain why it will either increase or decrease.

Complete all two parts $($a$-$b$).$

a$.$ There has been discussion by the incoming President to manipulate the U$.$S$.$ dollar so as to ensure it depreciates in value. If this were to occur, explain how this will impact U$.$S$.$ aggregate expenditures and equilibrium GDP as a result, explaining why this possible depreciation will cause these two measures to either increase or decrease.

b$.$ There has also been much in the way of discussion regarding the imposition of tariffs on various nations' goods when they are imported into the United States. Explain how this will impact the level of U$.$S$.$ aggregate expenditures and equilibrium GDP as a result, explaining why these two measures will either increase or decrease based upon this action.