Suppose the european and japanese economies succumb to a recession and reduce their demand for u. s. goods for several years. using as/ad framework, explain the macroeconomic consequences of this shock, both immediately and over time assume that the economy begins in steady state. at t=5, the foreign demand for u. s. goods drops for two periods. we model this as a drop in a, which becomes negative, at t=5 and t=6. at t=7, demand goes back to its long-run level, meaning a = 0 for t=7 and all future periods. a. show in a graph the as and ad curves at t=4, 5, 6, 7, and 8. b. show in the same graph the equilibrium (πt,ȳt) at t = 4, 5, 6, 7 and 8. c. show in three graphs the plots of: i) a vs t, ii)πt, vs t, and iii) yt vs t d. provide intuitions. what is happening at the time of the shock (t=5)? what is happening in the following periods? does the economy go back to the initial steady state or does it converge to a different one?