Investors should expect Dow to hit 40,000 in next 18 to 24 months, says strategist Neil Hennessy

Neil Hennessy, chief market strategist and portfolio manager at Hennessy Funds, joins CNBC's "The Exchange" to discuss Tuesday's market action, and explain why he thinks the Dow could hit the 40,000-mark within the next two years.
Tue, Aug 3 20211:26 PM EDT