In the file "var.wf1", the data for the growth rate (dprod), inflation (inflation) and for the short-term interest rate (term) of the US economy are given. 1) Estimate a VAR assuming that in the short run a structural demand shock affects contemporaneously all variables, an inflationary shock affects contemporaneously all variables apart from growth rate, while a monetary policy shock affects growth and inflation only one quarter after. (7 marks) 2) Based on these assumptions produce (in graphs) and comment the impulse response functions. (6 marks) 3) Based on these assumptions produce (in tables) and comment the variance decompositions