Though this is a problem in many OECD countries, in America the proportion of out-of-pocket spending has declined sharply in the past few decades.

尽管这是很多经济合作与发展组织国家的共同问题，但在美国，现金支付比例在过去几十年间显著下降。

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Three countries with a high proportion of counterfeits have already started tackling the problem with IMPACT's support.

在国际医疗产品打假专题小组的支持下，假冒药物比例很高的三个国家已经开始处理这一问题。

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But anxiety can become a problem when it becomes persistent or is out of proportion to the situation.

但是，一旦这种担忧持续时间过长或有些过度，就有可能演变为一种问题。

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Although restrictions have been easing for years, the proportion of problem gamblers in Britain has barely changed since 1999, the survey holds, and, at about 0.6% of adults, it is lower than in more puritanical America.

ECONOMIST: Gambling addicts

Like its sibling, stress is an economic, medical and social problem of epidemic proportion and is making us emotionally depleted, physically sick, and, incidentally, fatter.

FORBES: This Holiday Season, Stress is the New Fat

If they could collect and recycle a larger proportion of their bottles, that problem would be solved.

FORBES: How Corporate America Might Just Save Recycling