at the margins.

Measures of the excess burden

The cost of a distortion is usually measured as the amount that would have to be paid to the people affected by its supply, the greater the excess burden. The second is the tax rate: as a general rule, the excess burden of a tax increases with the square of the tax rate.

The average cost of funds is the total cost of distortions divided by the total revenue collected by a government. In contrast, the marginal cost of funds (MCF) is the size of the distortion that accompanied

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