We’ve talked a bit before about the Volcker Rule and how it’s going to have creepy unintended consequences because it is really hard to distinguish “market making,” which is what bank-broker-dealers are supposed to do, from “proprietary trading,” which is evil and destroyed the world. Today we have an excuse to talk about it again because (1) Uncle Vikram sort of shrugged off a question or two on it on this morning’s Citi earnings call, though he’s not quite in the Jamie Dimon camp of “I can’t hear you there will never be a Volcker Rule shut up shut up SHUT UP”; and more relevantly (2) Stanford finance professor Darrell Duffie just put out a study saying that the Volcker Rule is going to have creepy unintended consequences because it is really hard to distinguish “market making,” which is what bank-broker-dealers are supposed to do, from “proprietary trading.” Don’t be distracted from the rightness of this study (obvs!) by the fact that securities industry trade organization SIFMA paid Duffie to write it.* Instead, let’s focus on the important questions, like: where is my $50k check from SIFMA?
Much of this paper is a full-throated, conventional defense of Grossman-Miller market-making, which is nice and will bring a tear to your eye if you’re a market maker: Continue reading »





