Tesla Inc CEO Elon Musk raised concerns about the Federal Reserve increasing the interest rate by saying it could crush the stock market. During Tesla's fourth-quarter earnings call last week, Musk said he's worried that rates will soon exceed the average return of the S&P 500 if the Fed pushes interest rates past 6%, reports the Business Insider. "I think the Fed needs to be very cautious about having a Fed rate that potentially exceeds 6%," BI quoted him saying during the earnings call. "Why d