Nasdaq OMX Group CEO, Robert Greifeld, says Janet Yellen and the U.S. Fed Open Market Committee should exercize caution in increasing interest rates in 2014. He cites the heavy risk for long term investor outlook and psychology of the Fed moving too quickly in increasing interest rates, because of the steep drop in oil prices, the crash of the ruble, slowdown in Europe, deflationary trends in the eurozone and Japan, and slow growth in China. The Fed now has more room for taking a cautious approach says Greifeld, as wage growth is tepid, the dollar is strong, and oil prices are down significantly.