Iso- cost lines(等成本线) PA curve that contains all of the input bundles that cost the same amount is an iso-cost curve +E.g, given W, and W2, the $100 iso cost line has the equation w1X1+w2x2=100Iso-cost Lines （等成本线） uA curve that contains all of the input bundles that cost the same amount is an iso-cost curve. uE.g., given w1 and w2 , the $100 iso￾cost line has the equation w x w x 1 1 2 2   100