They tweaked the credit-scoring software of a microfinance firm so that only a random subset of people with marginal credit histories were accepted as clients.
他们对一家小额贷款公司的信用评分软件进行了调整，只有那些只有少量信贷历史的人可以作为贷款对象。
2
In order to sell an additional unit of output the firm must lower the price of all units sold (not just the marginal one).
为了多销售一单位产品，企业必须将所有出售产品的价格降低，而不仅仅是最后一单位产品。
3
It's commonly viewed as the only equilibrium outcome that each firm earns zero profit in the homogeneous product Bertrand game with constant marginal cost.