Byron Wien on Dow 30,000: Markets responding to news we're heading back to normal

The Dow just hit 30,000 today. Byron Wein, Blackstone Private Wealth Solutions vice chairman, calls into CNBC's 'Squawk Alley' to discuss the marker and what it means for markets going forward. For one thing, he says, the markets are responding to the idea that things are heading back to normal in the next year. But he warns the enthusiasm of investors can run ahead of the earnings of companies. So the question is, will companies be able to produce the earnings to justify the price, he asks.