Using time series data for the United States from 1990 to 2006,1 the following Consumption and Investment functions are estimated
C = -238.64 + 0.683Y - 0.0001355Y 2
I = -219.0 + 0.18Y
Assume a government expenditure of $2216.8 and a net export of -$615.4,
(a) determine the equilibrium national income, consumption and investment.
(b) What is the model multiplier?