Users with the uppermost levels of access are able to purchase root kits to engage in fraudulent activity and contract out phases of their fraud operations to a large network of willing participants.

拥有高级访问权限的用户可以购买root kits（译者：一种黑客入侵工具）参与欺诈活动并将它们的欺诈行动外包给其他众多愿意参到其中的参与者。

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Credit-card companies monitor every purchase and can identify fraudulent ones with a high degree of accuracy, using rules derived by crunching through billions of transactions.

ECONOMIST: Technology