How Effective are Trade Barriers? An Empirical Analysis of Trade Reduction, Diversion, and Compression
利用高度细化的数据，将贸易壁垒的影响分解为减少、转移和压缩效应，发现多边关税显著减少贸易，而贸易优惠导致贸易转移，且非关税壁垒有时反而增加贸易值。
We analyze the effects of trade barriers using highly disaggregated data. The level of disaggregation allows us to separate the effects of tariffs and nontariff barriers (NTBs) into reduction, diversion, and compression effects. We find that multilateral tariffs significantly reduce trade flows and that trade preferences have a significant diverting effect. We also find that higher multilateral tariffs tend to shift trade towards larger exporters, suggesting that the desire to minimize fixed costs associated with trading dominates any preference for variety. In the case of NTBs, we find that, as often as not, the imposition of an NTB leads to an increase in the value of trade; in industries with low import demand elasticities, the influence of rising prices outweighs the decline in quantity. © 2003 President and Fellows of Harvard College and the Massachusetts Institute of Technology.