Retail investing is up during the pandemic — Here's what people are buying

Retail investors have doubled their trading activity during the pandemic. Online brokers cite people spending more time at home, market volatility, and zero-dollar commissions. According to TD Ameritrade, some of the most popular stocks among retail investors last week were Tesla, Apple, Beyond Meat, Disney and Microsoft, and they're also sticking with American Airlines and Delta. J.J. Kinahan, chief market strategist at T.D. Ameritrade, and CNBC's Mike Santoli join "Squawk Box" to discuss.