NationsBank Corp. chief executive officer Hugh L. McColl Jr. came to California on Friday to say there is more to his megamerger strategy than buying into the nation's most populous state.

Speaking to the California Bankers Association 32 days after he announced the $60 billion merger agreement with BankAmerica Corp., Mr. McColl touted the advantages of bigness, said the combined company would better serve its markets than either partner could separately, and rejected criticisms that Californians might lose out in the deal.

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