A New Weapon For US Antitrust Authorities

When Christine Varney became the head of the antitrust division of America's Department of Justice upon the election of President Obama, it was widely expected that she would oversee a drastic tightening of merger regulation. At this point, however, the division is caught in the middle of a debate on the necessary changes to the criteria of regulation. Essentially, the question is 'how does one assess whether there is a enough competition in the a market?'. Until now, US antitrust authorities have focused on the size of the combined market share of merging firms, or the market structure approach. However,

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