Final answer:
A common market is an economic agreement between countries that allows for free trade between member countries, includes a common external trade policy, and allows factors of production to move freely.
Step-by-step explanation:
An economic agreement that has no barriers to trade between member countries, includes a common external trade policy, and allows factors of production to move freely between members, is known as a common market. This type of integration goes beyond a free trade area, which only offers free trade between its members. A common market, like the European Union for instance, also involves a common external trade policy and the mobility of goods, services, labor, and capital across member countries.