Originally posted by ahinton
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As for VAT, if I had that whiteboard I'd go on to explain the meaning of "the deadweight cost of a tax". Roughly speaking, taxing trade raises less revenue for the taxing authority than the value lost to the traders. The difference is the deadweight cost. The heavier the tax the greater the proportion of deadweight cost to revenue raised. (The next step in the exercise is to show that an external subsidy costs the subsidiser more than the additional value seen by the traders.) But taxes need to be raised somehow, whether they are raised on the trading of goods and services, or on the trading of labour, or on business profits, or on something else. Spreading them out over many activities has the advantages of minimising the deadweight costs and making tax harder to evade entirely.
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