(作为区域垄断，他们的价格被设定，边际效益由监管者保证)他们坚实牢固的信用评级可能被溶解。
(As regional monopolies, their prices are set and their profit margins are guaranteed by regulators.) their solid credit ratings could liquefy.
以边际成本理论为基础，通过比较两个信用政策，研究增量收入与增量成本的计算方法，从而确定其增量利润。
By comparing two credit policies, the author researches the computing methods of incremental revenue and cost and defines the incremental profit.
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