Here are the key issues at stake:What is the Single Market? The single market guarantees freedom of goods, people, services and capital — the so-called "four freedoms" of the European Union. Britain would have to accept the "four freedoms" to keep access to the single market while outside the European Union. What is the EU customs union? For example if an import from outside the customs union enters Turkey and customs duties are paid on it, those goods can then move freely throughout the customs union.

Source: The China Post January 18, 2017 16:05 UTC