Tesla's value drops $50 bn after Musk's 'Battery Day' announcements

Tesla saw a $50 billion dip in value after CEO Elon Musk said on 'Battery Day' that it would take three years to make a $25,000 self-driving car. Investors wiped $20 billion from Tesla's market value within two hours of close of trading, after Musk said it will take several years to halve battery costs and deliver an "affordable" car.