Mario Gabelli's full interview on the most important points in Buffett's 2021 letter

Mario Gabelli, chairman and CEO of GAMCO investors, has been attending Berkshire Hathaway's annual meeting in Omaha for decades and his firm has even sponsored a Friday night dinner before the event for more than 10 years. Gabelli joined "Squawk Box" on Monday to discuss what he finds most important from Warren Buffett's 2021 annual letter.