It has many activities, the most important being a common single market, consisting of a customs union, a single currency (adopted by 19 of 28 member states), a Common Agricultural Policy and a Common Fisheries Policy.
它有许多行动，最重要的一个就是形成一个单一市场，其中包括关税同盟、单一货币（截至2008年已被28个成员国中的15国所采纳）、共同农业政策以及共同渔业政策。