STRAIGHT-LINE PREDICTIONS Economists spend a lot of time trying to predict what will happen to people’s money if one or more variables in the world are tweaked. If you try to predict the future by assuming no variables ever change, you get predictions that look like these: “The horse is here to stay but the automobile is only a novelty—a fad.” —The president of Michigan Savings Bank advising Henry Ford’s lawyer not to invest in Ford Motor Co., 19032 “The world potential market for copying machines is 5,000 at most.” —IBM, to the eventual founders of Xerox, saying the photocopier had no market
...more

