Comparison of price caps and tariffs to counter a foreign monopoly
比较了进口关税与进口价格上限两种政策工具在监管外国垄断者时的效果，发现任何正关税都存在一组帕累托更优的价格上限，并以欧盟-俄罗斯天然气市场为例说明。
This paper compares import tariffs and import price caps as policy measures to regulate a foreign monopolist. We show that for any positive import tariff there exists a set of price caps each of which Pareto-dominates the tariff. This result is particularly important in the case of nontransferable utilities, as in the illustrated example of the EU-Russia gas market.