Investors slashed $50 billion from #Tesla's market value on Tuesday after CEO Elon Musk promised to cut electric vehicle costs so radically that a $25,000 car that drives itself will be possible - but not for at least another three years. Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en #BatteryDay