If GDP is 3,900, the multiplier is 8, and G falls by 10, wha New GDP is $ billion.

Question Can this be explained in a simple way? Thanks The following table illustrates a few rounds of the multiplier process for a 2 sector economy for an initial increase in exogenous planned investment of 50. delta PAE 50 35 24.5 17.15 delta y 50 35 24.5 17.15 What is the approximate value of the multiplier in this economy? 1.4 2.4 3.0 3.3 0.7 The first round effect on GDP comes for the increase in exogenous investment, but the subsequent rounds depend on the amount of the additional GDP/national income that is spent. This depends on the marginal propensity to consume. In round 2 we have 35 = c times 50. So c =0.7 and the multiplier is l/(l-0.7) = 3.3333 or approximately 3.3.

The country has investment multipier 2. Calculate the marginal propensity to save.

Exercise 4. Imports and the multiplier. The consumption multiplier tries to capture the idea that individuals increase their consumption expenditures when their income increases, even when it is only a short-term increase and their life time income didn't change. However, individuals not only consume domestic products but also, they import part of their consumption. Therefore, if domestic consumption reacts to changes in current income, then it is natural to think that consumption of foreign goods should increase as well. For example, when the economy is booming, imports usually rise. To incorporate this channel into the model, suppose the import equation is given by Mt =āmīt + xm Ỹt Ỹt are described by equations in the previous exercise It = āƒŸt — b(R₁ − ñ) Yt, Ct =ācīt + x Ỹt Ỹt. The other categories of expenditures follow the same rules as in class. a) Derive the IS curve for this new specification. b) What is the economic explanation for why the parameter xm shows up in the…