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Of the many activities of the Antitrust Division of the U.S. Department of Justice, we have summarized some that raise interesting economic issues. We describe recent improvements in the methodology to be used in "coordinated effects" analysis of mergers. We also discuss four cases brought by the DOJ that raise issues of market definition, the influence of common partial ownership of competitors, and the effects of fringe suppliers in constraining collusion by large firms. [ABSTRACT FROM AUTHOR]