The headlines tell us that the Dow Jones is up around 1,000 points since Donald Trump won the election on November 8th. The conventional wisdom is that this shows how much confidence people have in Trump’s ability to generate a healthy American economy. The argument is that if people are willing to buy stock in American firms, this indicates their belief that those firms will see improving profits over the next few years. They then draw the conclusion that more profitable firms indicate a healthier American economy. Although this argument is correct about stock prices reflecting an...