2. Isoprofit curve Weak Axiom of Profit Maximization (WAPM) if, yt are in Y, and choice by firm under price ps and pt then p'ys2p'y' we can get:(p-p)(y3-y)≥0or△p△y≥0 价格上升,最优产量也上升 lecture 2 for Chu Kechen Honors Collegelecture 2 for Chu Kechen Honors College 2.Isoprofit curve • Weak Axiom of Profit Maximization (WAPM) if y s , y t are in Y, and choice by firm under price p s and p t . then . we can get: or  s s s t p y p y ) 0  s t s t (p -p )(y - y    p y 0 价格上升，最优产量也上升