但是由于市场存在着内外部的缺陷，中低收入阶层在居住方面往往表现为支付能力不足。
Because there exists market failure, the middle and lower income stratums usually show insufficient paying ability.
但是由于市场存在着内外部的缺陷，中低收入阶层在居住方面往往表现为支付能力不足。
Because there exists market failure, the middle and lower income stratums usually show insufficient paying ability.
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