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.
以保定市抽样调查样本为基础，从家庭收入的角度研究准入标准测算方法。
Based on the household income, researches the calculation method of access standard by taking the example of Baoding.
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