The stock market has changed a lot since the infamous crash of 1929. Some of the differences are highlighted in "1929," a new book by Andrew Ross Sorkin. Read Business Insider's recent profile of Sorkin here. When you see the famous photos from outside the New York Stock Exchange in 1929, it looks like a different world. For one, why are there so many people there? If you visit the intersection of Wall Street and Broad Street today, even during volatile periods in the market, it's a pretty tame se ...