Mergers and acquisitions are regulated by competition laws because they may concentrate economic power in the hands of a smaller number of parties. Oversight by the European Union, the competition laws have been enacted under the Directive 2005/56/EC on Cross-border mergers and the Economic Concentration Regulation 139/2004, known as the "EUMR". The law requires that firms proposing to merge apply for prior approval from the Commission. The European Commission (EC) has exclusive competence over concentrations that meet certain thresholds. This is known as community dimension. A concentration with a turnover of the following will trigger commission jurisdiction. Mergers that transcend national borders and with an annual turnover of the combined business exceeds a worldwide turnover of over EUR 5000 million and Community-wide turnover of over EUR 250 million must notify and be examined by the European Commission. Merger regulation thus involves predicting potential market conditions which would pertain after the merger. The standard set by the law is whether a combination would "significantly impede effective competition... in particular as a result of the creation or strengthening of a dominant position..."