I think that we should add a little bit of cynicism to everything we write. Whenever we mention an incontrovertible fact, like 2 times 5 is ten, add to it "or thirteen if Congress passes a special law." The point, expressed humorously and repetitively, is that some laws are discovered rather than legislated. These laws can be found in the area of economics as well, e.g. if you pay your employees more than you can afford, you'll go out of business, unless Congress passes a special law.