Charles Kettering, head of the research division of General Motors described consumeritis thus, just days before the crash: "The key to economic prosperity is the organized creation of dissatisfaction." Inequality skyrocketed. While output per man-hour shot up by 32 percent between 1923 and 1929, wages crept up only 8 percent. In 1929, the top 0.1 percent of the population earned as much as the bottom 42 percent. Business-friendly administrations reduced by 70 percent the exorbitant taxes paid by those with an income of more than $1 million. But in the summer of 1929, businesses reported sharp increases in inventories. It was the beginning of the end. Were stocks overvalued prior to the crash? Did all stocks collapse indiscriminately? Not so. Even at the height of the panic, investors remained conscious of real values. On November 3, 1929 the shares of American Can, General Electric, Westinghouse and Anaconda Copper were still substantially higher than on March 3, 1928. John Campbell and Robert Shiller, author of "Irrational Exuberance", calculated, in a joint paper titled "Valuation Ratios and the Lon- Run Market Outlook: An Update" posted on Yale University' s Web Site, that share prices divided by a moving average of 10 years worth of earnings reached 28 just prior to the crash. Contrast this with 45 on March 2000. In an NBER working paper published December 2001 and tellingly titled "The Stock Market Crash of 1929 - Irving Fisher was Right", Ellen McGrattan and Edward Prescott boldly claim: