Sufficient statistics for tariff reform when revenue matters
发现，在关税收入重要的情况下，只需少数充分统计量（主要是关税的广义均值和方差）就能简化判断关税改革能否在不减少收入的同时提高福利，并给出了一类线性改革规则。
What kinds of tariff reform are likely to raise welfare in situations where tariff revenue is important? General conditions for welfare to rise without reducing tariff revenue are opaque. We show that they can be greatly simplified using a small number of sufficient statistics, primarily the generalized mean and variance of tariffs. We present sufficient conditions for a class of linear tariff reform rules that guarantee higher welfare without a loss in revenue. The rules consist of convex combinations of (i) trade-weighted-average-tariff-preserving cuts in dispersion; and (ii) uniform tariff cuts that preserve domestic relative prices among tariff-ridden goods.