Why Wall Street MattersBy: William D. Cohan If you like your smartphone or your widescreen TV, your car or your pension, then, whether you know it or not, you are a fan of Wall Street. William D. Cohan, bestselling author of House of Cards, has long been critical of the bad behaviour that plagued much of Wall Street in the years leading up to the 2008 financial crisis, and, as an ex banker, he is an expert on its inner workings as well. But in recent years he has become