利润边际

Because price exceeds marginal cost, an extra unit sold at the posted price means more profit for the monopolistically competitive firm.

因为垄断竞争企业的价格高于其边际成本，成本，以牌价多销售出一个单位产品就意味着利润多了。

A more durable model for less privileged companies would involve more higher-margin activities, based on innovation and higher quality, with their home-grown brands to the fore.

对于没有多少特权的公司来说，更长久的经济模型应该是首先考虑培养本土品牌，发展更多基于创新和高品质的高边际利润的经济活动。

We construct a Salop model to analyze three conditions: no-fee, foreign fee, and surcharge. Our meaningful conclusions mainly are: When the interchange fee is equal to ATM's marginal cost, the bank's profit could be maximized; for pure ATM businesses, foreign fee is strategy-substitutable and surcharge is strategy-complementary; for banking competition, foreign fee is strategy-complementary and surcharge is strategy-substitutable.Keywords: ATM, foreign fee, surchargeJEL Number:

本文以Salop环形城市模型分析了跨行取款不收费制、跨行费制、额外费制下银行在ATM业务上的成本收益情况，本文有意义的结论主要有：当交换费等于ATM的边际成本时，两种费制都会使银行达到利润最大化；在纯粹ATM业务上，跨行费是战略替代的，额外费是战略互补的；在银行竞争上，跨行费是战略互补的，额外费是战略替代的。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。