In the last recent period we have been told that Goldman’s is doing “god’s work”, that they are “sorry” for the “things” they have done wrong, and that their operations are essential to the well-being of the economy. Conversely, there have also been (influential) calls to “break up the banks” so that retail banking would be separated from the investment (risk-taking) activities. During the neo-liberal period, these two distinct roles became blurred and banks increasingly behaved as hedge funds. Legislation that supported the separation was abandoned under intense lobbying from vested financial market interests. The mess that these developments has created is now for all too see. Modern monetary theory (MMT) provides some simple rules for assessing whether the break-up plan is sensible and necessary. That is what this blog is about.