For Country X entering a customs union, under which conditions is trade creation more likely to surpass trade diversion?

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when tariffs were initially high and the customs union includes many countrieswhen tariffs were initially high and the customs union includes only a few countrieswhen tariffs were initially low and the customs union includes many countrieswhen tariffs were initially low and the customs union includes only a few countries

Explanation

Trade creation is more significant than trade diversion when Country X starts with relatively high tariffs and forms a customs union with a large number of member countries. High initial tariffs mean that removing them within a large customs union encourages more efficient trade among members, outweighing any diversion effects.