Secular booms can last up to 20 years and we're in one right now, says Federated Investors' Duessel

Linda Duessel, Federated Investors senior equity strategist; Sarat Sethi, Managing Partner at Douglas C. Lane and Associates and CNBC's Mike Santoli join the 'Squawk Box' team to discuss the bull market and if they're worried.
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Tue, Aug 21 20187:07 AM EST