Marginal XXXXXXX curves allow us XX XXX XXX XXXXXXXX least XXXXXXX that can be earned. These XXXXXX are XXXX in conjunction XXXX XXXXXXXX XXXX curves to determine how the decision maker XXX XXXXXXXX XXX benefits while XXXXXXXXXX XXX XXXX. This in turn maximizes XXX profits. The XXXXX where XXXXXXXX XXXXXXX XXXXX XXXXXXXXXX with XXX marginal XXXX XXXXX is XXX point at which the decision XXXXX should want XX XXXXXXX. XXXXXXXX it may XXXX that the net profits would XXXX be X, XXXX XX XXXXXXXX not XXX case. XXXXX XXX graph is aXXXXXXXX XXXXXXX curve, XXX XXXXXX benefits XXXX XXXX likely XX XXXX XXXXXX and XXXX XXXXX XXX decision maker to operate XX a low cost, higher profit system.