What economists call an ability to make "compensating differences" is a valuable tool in everyone's arsenal. If people are prohibited from doing so, they are always worse off. You say, "Williams, I never heard of compensating differences. What are they?" Jimmy Soul's 1963 hit song, "If You Wanna Be Happy," explained the concept of compensating differences. His lyrics went: "If you want to be happy for the rest of your life, never make a pretty woman your wife. So from my personal point of view, get an ugly girl to marry you." His point was that an ugly woman would...