Ever notice that when oil prices are heading south, which is good for consumers, there is always the other edge of the sword for how that impacts energy stocks that could skew the market. And let’s not forget that when the Fed leaves interest rates low, where so many of us like them–that also can encourage risky lending. But if the Fed hikes them, they could trigger an economic slump. Is there any wonder that President Harry Truman used to yearn for a “one-armed economist,” one who wouldn’t be inclined to say, “But on the other hand.” Bada bing.