When a few countries join a trade bloc, it not only expands the market for their firms but also creates a larger market for the countries outside the bloc.

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When countries form a trade bloc, they reduce trade barriers among themselves, which indeed expands the market for firms within the bloc. However, by doing so, they often raise trade barriers against countries outside the bloc, making it harder for these external countries to access the enlarged market, not easier.

When a Few Countries Join a Trade Bloc, It Not