All very interesting but the author fails to discuss the survivor bias inherent in the Dow Jones Index (or any other index, for that matter). This is the results of the companies that survived. A lot of companies have dissappeared over this time, both through poor performance or going bankrupt. In fact, GE is the only company that has remained on the index since it's inception.

So unless you're buying index funds that track the DJIA, the chart loses it use. Because when we look at this, we see that the stock market always goes up with time. But what we are looking at is the fact that the 30 largest/most successful companies in the USA keep pace with inflation. Which is hardly a shock.

Note that I'm not arguing some of the authors points, I'm just encouraging an open mind when viewing graphics like this - you've got to know what you're looking for.