It is also intended to drive economic integration whereby the once separate economies of the member states become integrated within a single EU-wide economy. Half of the trade in goods within the EU is covered by legislation harmonised by the EU, the creation of the internal market as a seamless, single market is an ongoing process, with the integration of the service industry still containing gaps. It also has an international element, with the market represented as one in international trade negotiations. One of the core objectives of the European Economic Community was the development of a common market offering free movement of goods, service, people. Free movement of goods was established in principle through the union between its then-six member states. However the EEC struggled to enforce a single due to the absence of strong decision making structures. It was difficult to remove intangible barriers with mutual recognition of standards, in the end, it was launched on 1 January 1993. The new approach, pioneered at the Delors Commission, combined positive and negative integration, negative integration consists of prohibitions imposed on member states of discriminatory behaviour and other restrictive practices. Positive integration consists in approximation of laws and standards, especially important in this respect is the adoption of harmonising legislation under Article 114 of the Treaty on the Functioning of the European Union. Thus harmonisation was largely used to basic health and safety standards were met. By 1992 about 90% of the issues had been resolved and in the year the Maastricht Treaty set about to create an Economic. Work on freedom for services did take longer, and was the last freedom to be implemented, mainly through the Posting of Workers Directive, in 1997 the Amsterdam Treaty abolished physical barriers across the internal market by incorporating the Schengen Area within the competences of the EU. The Schengen Agreement implements the abolition of border controls between most member states, common rules on visas, and police and judicial cooperation, even as the Lisbon Treaty came into force in 2009 however, some areas pertaining parts of the four freedoms had not yet been completely opened. Those, along with work on the economic and monetary union. The European Union is also a customs union and this means that member states have removed customs barriers between themselves and introduced a common customs policy towards other countries. By agreement between the Union and the states concerned Andorra, Monaco, San Marino and Turkey also participate in the EU Customs Union, Article 30 TFEU prohibits member states from levying any duties on goods crossing a border, both goods produced within the EU and those produced outside. Neither the purpose of the charge, nor its name in domestic law, is relevant, since the Single European Act, there can be no systematic customs controls at the borders of member states. The emphasis is on post-import audit controls and risk analysis, physical controls of imports and exports now occur at traders premises, rather than at the territorial borders
The Berlin Wall (1961-1989) symbolised a bordered globe, where citizens of the Soviet Union had no right to leave, and few could enter. The EU has progressively dismantled barriers to free movement, consistent with economic development.
All EU citizens have the right to child support, education, social security and other assistance in EU member states. To ensure people contribute fairly to the communities they live in, there can be qualifying periods of residence and work up to five years.