Oil declines again, pros weigh unexpected risks By: CNBC.com News November 13, 2014 at 16:58 PM EST On Thursday, again, the price of oil tumbled with the spot price slipping below $75 a barrel; that's a four-year low. At some point, that's a problem. Read More >> Related Stocks: Chevron Corp Energy Select Sector SPDR Exxon Mobil Schlumberger Ltd