JPMorgan's Kolanovic says it's hard to find any bubbles in the stock market

Wall Street Bull statue in New York's Financial District.
Erik McGregor | LightRocket | Getty Images

JPMorgan's quant guru Marko Kolanovic believes there's no need to worry too much about bubbles in the stock market, despite all the recent chatter.

He does see a bubble in one particular market derivative, however.

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