I never know what markets are going to do, says Warren Buffett, Berkshire Hathaway CEO sharing his observations. But I know what markets are going to do over a long period of time - they're going to go up. We've always been a net buyer of stocks, says Buffett. For more of Warren Buffett's wit and wisdom visit https://Buffett.CNBC.com » Subscribe to CNBC: http://cnb.cx/SubscribeCNBC About CNBC: From 'Wall Street' to 'Main Street' to award winning original documentaries and Reality TV series, CNBC has you covered. Experience special sneak peeks of your favorite shows, exclusive video and more. Connect with CNBC News Online Get the latest news: http://www.cnbc.com/ Find CNBC News on Facebook: http://cnb.cx/LikeCNBC Follow CNBC News on Twitter: http://cnb.cx/FollowCNBC Follow CNBC News on Google+: http://cnb.cx/PlusCNBC Follow CNBC News on Instagram: http://cnb.cx/InstagramCNBC Warren Buffett: When Stocks Go Down, It's Good News | CNBC