Just a quick, cranky reminder: Despite what you may have read, the Dow Jones industrial average did not hit a new high today in any meaningful sense. After adjusting for inflation, the Dow was higher in 2000 than it is today. It was also higher in 2007. It would need to rise another 10 percent or so to hit an all time high in real (i.e., inflation-adjusted) terms. … There are other, less arbitrary indexes of the U.S. stock market, such as the S&P 500, which tracks 500 (rather than just 30) big U.S. companies. The S&P 500, for what...