ETFs have already broken their annual inflow record—and summer isn't even over yet. The pace of flows has jumped from $2 billion a day to more than $4 billion a day. Some 1,800 ETFs are taking in cash. So what's behind all the action?

On this episode of Trillions, Eric and Joel speak with Invesco's John Hoffman, who heads the company's ETF and index business in the Americas. They discuss why the issuer is quietly having a great year, what's behind the flows, the rise of the DIY retail investor, and the strategic outlook in the ETF business. You'll also hear about Invesco's equal-weighted S&P 500 ETF ($RSP), a commodities future ETF ($PDBC), a low volatility fund ($SPLV), and more.

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