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An economist claims that he has found evidence to support the assumption that the investment expenditure...

An economist claims that he has found evidence to support the assumption that the investment expenditure increases with Y. More specifically, I relies on both r and Y, and: I(r,Y) = Ye^-r -r

1. Derive the government-purchase multiplier under this new assumption. (Recall that in the Keynesian cross model, r is fixed, but Y is endogenous.)

2. Derive the taxation multiplier under this new assumption.

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