Joe Raedle / Getty Images Elon Musk added $167 billion to his net worth as Tesla Inc. (NASDAQ: TSLA) announced a major step forward in its self-driving car business. That took his total to$638 billion, according to the Bloomberg Billionaires Index. That makes him the first person to break the $600 billion barrier. (Number two on Bloomberg’s list is Google c0-founder Larry Page, who has a net worth of$265 billion.) 24/7 Wall St. Key Points Tesla Inc. (NASDAQ: TSLA) CEO Elon Musk is the first person w ...