Treasury Secretary Jack Lew told members of Congress Wednesday that he will announce a new administrative effort this week to stop corporate inversions, as attempts at legislation to stop companies from moving their headquarters out of the U.S. have failed. Lew said in a letter to lawmakers that he would issue "additional targeted guidance to deter and reduce further the economic benefits of corporate inversions." Lew first took action to undercut the tax benefits of inversions in September 2014, announcing several specific rules meant to prevent companies from moving their headquarters abroad for tax purposes and limiting the tax breaks...