2. Isoprofit curve o The profit p·f(x) 丌(p,W)=p·f(x)-W.X=元 slope=w/ We then got the q=f(x) isoprofit curve Then Vf(x)=wlp and D2f(x')is negative semi-definite 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