NEW YORK, Nov 16 (Reuters) - U.S. stock index futures briefly added to losses on Tuesday after data showed U.S. core producer prices unexpectedly fell in October.
S&P 500 futures declined 4 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures sank 46 points, and Nasdaq 100 futures lost 12 points.