How does the size of major trading blocs such as the EU impact member countries' economic interactions?

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It enhances their trade balanceIt strengthens their comparative advantageIt improves their overall balance of paymentsIt positively affects their terms of tradeIt increases their foreign direct investment

Explanation

The expansion of large trading blocs like the EU typically leads to an improvement in the terms of trade for member countries, meaning they can obtain more imports for a given quantity of exports, enhancing their economic welfare.