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CNBC's Jim Cramer said Monday American Express

is prioritizing long-term growth over boosting earnings per share — and that's exactly why the stock is a buy.

"American Express is down more than 13% from its all-time highs set late last year," the "Mad Money" host said. "I think it's a terrific opportunity in one of the best-run companies on earth."

"I think you're getting a terrific buying opportunity," he said.