Which of the following is not an example of how trade agreements, like NAFTA, lower trade barriers?

Trade agreements such as NAFTA reduce barriers to buying and selling goods across borders, for example by lowering tariffs or removing quotas. They can also encourage companies to do business in other member countries. Making international travel possible without a passport is not a trade-barrier reduction, so “They make it easier to travel internationally without a passport” is the best answer.

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