我觉得下面解释纯损的例子不错
deadweight loss :It is a loss to buyers and sellers in a market not offset by an increase in government revenue.
For example ，Imagine that joe cleans jane's house each week for 100 dollars ,the opportunity cost joe's time is 80 dollars ,and the value of a clean house is 120 dollar s to jane .so now the total surplus is 40 dollars . But now if the government leveies a 50 dollars tax on the providers of cleaning services ,as a result this trade wouldn't happen .so now the tax make joe and jane worse off by a total of 40 dollars ,but which the government doesn't get .so we say :tax cause deadweight loss becuse the prevent buyers and sellers from realizing some of the gains form trade .
So now ,you should understand that deadweight loss exist beacuse it isn't got by the goverment ,because the trade doesn't happen .
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