关税障碍妨碍了进囗货的流入。
因此，全国市场不再受阴于内部的关税障碍。
So the national market was not hindered by internal customs barriers.
1707年后，英格兰、苏格兰和威尔士形成关税联盟，1807年后爱尔兰加入。因此，全国市场不再受阴于内部的关税障碍。
England, Scotland, and Wales formed a customs union after 1707 and this included Ireland after 1807. So the national market was not hindered by internal customs barriers.
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