NBC/"Freaks & Geeks"Wall Street is changing — fast. Investment banks are having a torrid time. Investors are in the ascendancy. Technology is changing everything. Boston Consulting Group tackled some of these issues in a big report on capital markets and investment banking on Tuesday. One interesting takeaway is that investment banks are now in an information business, rather than a capital business. In times gone by, big banks had big balance sheets and would take big positions in the markets.