2. Isoprofit curve- o The profit p·f(x)-w.x=元 丌(p,W)=p·f(x)-W.X=元 Slope=w/p We then got the g=f(x) isoprofit curve ° Then Vf(x)=w 元/p and Df(x)is negative seml-gefinite lecture 2 for Chu Kechen Honors Collegelecture 2 for Chu Kechen Honors College 2. Isoprofit curve • The profit : • We then got the isoprpfit curve . • Then and is negative semi-definite.   ( , ) ( ) p p f w x w x =  −   q x p f  −  ( ) x w x =   / p slope / = w p q f = ( ) x x * f p ( )  = x w/ 2 D f ( ) x