In Europa Universalis II, a country's trade efficiency is a number which abstractly quantifies how good its trading is. Trade efficiency (abbreviated TE) is used in the computation of trade taxes and trading income, as well as success in getting merchants into centers of trade, and their stickiness once in. Trade efficiency is determined based on a country's trade technology, domestic policies, religion, and several other factors. The base level of trade efficiency is a function of the country's trade technology level: Then the following modifiers apply: