Customs unions: Two or more countries decide not to impose tariffs on each other’s goods and agree to impose common external tariffs on goods from countries outside their customs union. Setting common external tariffs is what makes a customs union different from a free trade area. This article explains more.
Britain could use Turkey as a model for post-Brexit trade agreements because they have a customs union with the EU. Sir Andrew Cahn, the former chief executive of UK Trade and Investment explains what that could look like.