现在一大半的也门人每天都嚼咔特，这会有不良效果。
Now more than half of Yemenis chew it daily.This has bad effects.
即使可以预见这种不良效果会出现也是成立的。
This is true even if it is foreseen that the bad effect would probably happen.
在长期，价格控制在信号传递以及效率上的不良效果将会超过其收益。
In the longer run, however, the damaging effects of price controls on incentives and efficiency will outweigh the benefits.
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