Calculate the ratio of total real government expenditure to GDP on a quarterly basis for an economy of your choice for the period 1950–2015. Also calculate the real interest rate on a quarterly basis as a six-month Treasury bill rate minus the inflation rate. Plot these two variables as time series. The real intertemporal model predicts that a temporary increase in government spending increases the real interest rate. Do you observe anything in your chart that is consistent with this prediction? Why or why not?