Returning to fraud detection, imagine a linear regression model with a transaction amount feature.

回到欺诈检测问题，设想一个具有交易金额特征的线性回归模型。

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Some small merchants require credit purchases to have a minimum amount to compensate for the transaction costs.

一些小商户为持卡消费设立最低消费额，以补偿交易成本。

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If a read transaction is directed at a copy that fails or does not return in a reasonable amount of time, the transaction can be routed to another copy.

如果一个读事务被发送到一个出现故障或者在合理时间内未能返回的副本，那么可以将该事务路由到另一个副本。

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Users pay a small amount for each transaction.

VOA: special.2009.11.02

The service can work in a few different ways: parents can set a monthly allowance, parents can require approval via text for any transaction above a certain amount.

FORBES: Virtual Piggy Launches to Help Parents Manage Kids' Online Spending

Each time they do so, Visa takes a little of the transaction amount for itself.

FORBES: Visa's IPO Hopes To Break Books

It is also promising not to make recipients pay, and to charge originating banks only a small amount per transaction.

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