There are many ways to control the service of chain stores. The Mystery Survey which is broadly used is an effective way to reduce the "Delivery Gap" in the total service gap.

在众多控制连锁零售店服务质量的方法中，神秘人的方法可以缩小服务质量差距中的“传递差距”，现已被越来越多的连锁品牌所使用。

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Stephen Barry, specialist clinician for the Be Safe Service, said the new approach would meet a significant gap in service for this age group.

BBC: Young girl sits on a staircase and covers her face.

Mr Sharpe has started a company, Financial Engines, to provide an Internet service to fill this gap.

ECONOMIST: Money managers

But an official study in 2010 said payday loans provided a legitimate, useful, service that helped cover a gap in the market.

BBC: Payday loan rates 'to be limited'