On Monday, April 25, 2011, the Supreme Court will hear arguments in the Halliburton case,1 a case whose outcome may have a profound impact on future securities fraud class actions filed in the United States. Indeed, the Court may decide whether proof of loss causation prior to merits-based discovery is necessary to certify a securities class action brought under Rule 10b-5, and may also address to what extent a district court may consider, at the class certification stage, evidence that attempts
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