解: 边际收入MR=MPP Q =98-6L MR=(98-6L)·50=4900-300L 边际成本MC=40 MR=MC Q≈16解： 边际收入 边际成本 MR L L L dL dQ MP MR MP P L L Q (98 6 ) 50 4900 300 98 6 = −  = − = = − =  MC = 40 16 = Q MR MC