FTA是啥

问题如下：

Q. If Brazil and South Africa have free trade with each other, a common trade policy against all other countries, but no free movement of factors of production between them, then Brazil and South Africa are part of a(n):

选项：

A.customs union. B.common market. C.FTA.

解释：

A is correct. A customs union extends an FTA by not only allowing free movement of goods and services among members, but also by creating common trade policy against non-members. Unlike a more integrated common market, a customs union does not allow free movement of factors of production among members.

A正确。关税同盟不仅允许商品和服务在成员国之间自由流动，而且还制定针对非成员国的共同贸易政策，从而扩展了自由贸易协定。与一体化程度更高的共同市场不同，关税同盟不要求生产要素在成员国之间自由流动。