WASHINGTON — James Dimon, the chief executive of JPMorgan Chase & Co., dismissed the growing calls to nationalize financial institutions and said lawmakers and pundits should stop girding for government takeovers.

"I don't know what they mean whey they say nationalization," he told reporters Wednesday after a speech at the U.S. Chamber of Commerce. "It wouldn't be a great thing to nationalize a lot of banks that are perfectly healthy. That would be a terrible mistake."

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