Mean St.: David Weidner on the logic of the “Robin Hood” financial transactions tax. Chuck Jaffe on investing, not gambling, in the stock market. Although Jaffe doesn’t mention it, only about 5% of Wall Street investments are on the basis of fundamental financial analysis. Jason Zweig discusses Ron Paul’s investment strategy: gold, real estate and shorting stock in American companies. Dennis Berman on data and data analytics. Sign on here.