The European Union (EU) is one of the main users of the antidumping instrument. The EU is also a unique example of a regional trade agreement that has abolished the use of antidumping measures in force between the integrating parties. The chapter analyzes the effects on trade of imposing and abolishing antidumping measures in the EU based on empirical evidence. The imposition of antidumping measures is analyzed from the points of effectiveness, that is, if the protection is effective as regards EU producers, the exporters of allegedly dumped products and third country exporters; and efficiency, that is, the cost of protection for EU user industry and consumers. The abolition of antidumping measures is analyzed from the point of injury to EU producers when it comes to price undercutting and loss of market shares; and possible changes in the use of the antidumping instrument against third countries. The chapter also analyses the antidumping measures between the EU and the United States, as well as the experiences with abolishing antidumping measures in the EU and the European Economic Area (EEA) as an inspiration for the Transatlantic Trade and Investment Partnership (TTIP) negotiations.