As a snapshot of global financial markets’ ups and downs, look no further than U.S. billionaire investor, Warren Buffett. In 2008, he paid $231 million for a 10% stake in BYD Co., China’s largest maker of rechargeable batteries and whose chairman, Wang Chuanfu, nurtured a dream of making electric cars. BYD’s F3 sedan was China’s best-selling marque in 2009 and 2010, but its hybrid F3DM and e6 electric model have not met with similar success and the company has had to delay the U.S. launch of the e6 until 2012. The company’s share price fell by 14% on Tuesday in the wake of a third-quarter profits warning. The value of Buffett’s stake is now down by $2 billion from its peak in October 2009, though still double what he paid for it.