Citi's Francesco Martoccia: Here's what to make of falling oil prices

Let's talk energy. Oil, it's up a little bit today, but overall it's been a weak year. Now, falling oil is great for prices at the American gas pump.We are nearly below $2 a gallon in some areas of the United States. So, if you're a driver, this is good news. But if you're an investor, not so much.The big XOP oil and gas ETF down 8% in a year, underperforming the S&P 500 by about 20%. And as oil keeps going down, there is more focus on OPEC. OPEC of course has been adding barrels to the market if we have be ...