Family Dollar Stores Inc. spurned a $9 billion offer from Dollar General Corp. in favor of a lower bid from Dollar Tree Inc., saying it was concerned the Dollar General deal wouldn’t be able to pass antitrust hurdles.

The board unanimously rejected the Dollar General proposal and reaffirmed last month’s pact to merge with Dollar Tree, according to a statement today from the Matthews, North Carolina-based company. Dollar Tree has agreed to pay about $8.5 billion, excluding debt.

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