Lesson One: What Really Lies Behind the Financial Crisis? - Knowledge@Wharton

It is a simple rule, but like many other rules, there is a great temptation to break it. If you are a financial intermediary you should not take positions (i.e. buy and hold), but merely work as a conduit. You make your profits on transactions not market moves. A mental literature review of this idea goes back at least to Hasbrouck and Sofianos (1993) and Madhaven and Sofianos (1998). (True