Luke Skywаlker, Princess Leiа аnd Han Sоlо are in agreement abоut the AD curve but they are having a heated argument about the AS curve. Luke states that "only changes in short-run output can shift the AS curve", while Leia argues that "using rational expectations, only changes in the past value of inflation can shift the curve." Finally, Han Solo claims that "the steeper the AS curve, the bigger the (up or down) shift of the curve after an inflation shock." Who is right? Select all that apply.