Since 2015, the European Commission has been working to create an energy market  and for the defence industry.  Home Member States are free to transfer their investments and the benefits they derive from them. Such transfers may be made in freely convertible currency using the exchange rate in force on the market in accordance with the procedures established by the Member State receiving the investment. Member States may not adopt trading measures which restrict the free transfer of funds invested or activities carried out in their territory. A fiscal union is an agreement to harmonise tax rates, set a common level of public sector spending and borrowing, and reach a common agreement on national deficits or surpluses. In early 2012, the majority of EU Member States agreed on a fiscal compact that is a less restrictive version of a full fiscal union. a common market is an extension of the concept of a customs union, with the additional feature it provides for the free movement of labour and capital between members; The common market of the Benelux countries was an example of this, until it was transformed into an economic union in 1959. To be defined as a common market, the following conditions must be met: Mercosur signed free trade agreements with Israel in December 2007 with Egypt in August 2010, the State of Palestine in December 2011 and Lebanon on 18 December 2014.  Full economic integration includes a single economic market, a common commercial policy, a single currency, a common monetary policy and a single fiscal policy, including common tax and benefit rates – in short, full harmonisation of all policies, phrases and economic trade rules.
In the absence of a single external tariff, trade flows would be distorted. For example, if Germany imposes a 10% tariff on Japanese cars, while France levies a 2% tariff, Japan would export its cars to French car dealers and then resell them to Germany, thus avoiding 80% of the tariffs. This will be avoided if a common tariff is shared between Germany and France (and other members of the customs union). However, the EEC has struggled to enforce a single market due to the lack of strong decision-making structures. It has been difficult to remove light curtains with mutual recognition of common norms and rules due to protectionist attitudes. The transition to a common market has some drawbacks. On the one hand, businesses that were previously protected and subsidized by the government may struggle to stay in the water in a more competitive landscape. .