Assume that the economy hits a recession by December 2022. The US government decides to increase government expenditure (imagine stimulus checks, increases in government expenses due to higher social welfare spending, etc.) by $2000. Suppose that central bank adjusts money supply to hold interest rates constant which maintains private investment. Also, assume that marginal propensity to consume is 3/4 Using this information, how large is the increase in AD due to the above fiscal policy?