This is something that really needs to get more attention. William Cohan in the New York Times:
The easiest and most profitable risk-adjusted trade available for the banks is to borrow billions from the Fed — at a cost of around half a percentage point — and then to lend the money back to the U.S. Treasury at yields of around 3 percent, or higher, a moment later. The imbedded profit — of some 2.5 percentage points — is an outright and ongoing gift from American taxpayers to Wall Street.
H/t Ezra Klein.
I also came across this from James Kwak at the Baseline Scenario:
[I]f you see a company that has very high profits over a sustained period, there are two possibilities: either it is benefiting from a non-competitive market (e.g., it is a monopoly), or it is simply exceptional at innovating and staying ahead of the competition for years on end. If you see a whole industry that has sustained high profits, however, the latter explanation cannot hold, and you should immediately suspect a lack of competition.
[T]he thing that we should celebrate is not high profits, but competition. The pursuit of high profits is what motivates competition; but if a whole industry achieves high profits, then what you are seeing is not competition, but its opposite.