PFOF. Refresher on Payment for Order Flow.
- https://www.bloomberg.com/opinion/articles/2022-08-25/some-free-brokers-are-cheaper-than-others
- https://www.bloomberg.com/opinion/articles/2021-02-05/robinhood-gamestop-saga-pressures-payment-for-order-flow
- Prereq: Remember (loosely) a public exchange (eg NYSE) = specialist = receives all bids and asks and matches them, like an order book matching both sides. A market maker (eg Jane Street) = wholesaler = holds assets themselves to provide liquidity, posts both the bid prices and ask prices themselves, then manages (many) single-sided transactions against their inventory.
- Key piece: The randomness of the retail investor, expecting the trade decisions to be more on the uninformed side. Most positions traded directly with the exchange are (more than 50% coin flip) informed, and therefore the market maker acting as a middleman to fill bids and asks would (more often than not) LOSE money as the market moved. The trade was smart (usually large, and by institutional investors), and happened before the asset moved in the undesirable direction, so the wholesaler who intermediated the transaction lost money. Because of this, spreads between bid and ask on public exchanges are quite large.
- So brokers like robinhood will work directly with market makers like citsec. They give the buyer a lower price, give the seller a higher price, pocket a bit of the difference, and give a bit back to the broker for sending them the execution. As long as those 4 sum up to less than the spread on the public exchange, all 4 parties win (by cutting the exchange out).
- Assuming the public exchange bid/ask spread is 15 cents, and the wholesaler spread is 5 cents, the actual distribution of the remainder is about 80% price improvement for the retail buyer/seller, and 20% PFOF back to the broker. So the broker makes 2 cents (PFOF), the retail buyer and seller make about 4 cents each (compared to if their trade was executed on an exchange), and the wholesaler makes 5 cents (the spread).
- Obviously, the naive assumption is that WITH this flow, the market maker will front-run your trade, make money, and give some back to the broker. So those 2 parties benefit, and the retail investors (buyer+seller) have been shafted. This has been disproven many times empirically (every study on PFOF price improvement) as well as lawfully; the SEC polices this explicitly.
- This kickback to the broker is also what allows them to subsidize the fees, making transactions free. Another benefit to retail. Without PFOF, we’d have to pay commissions again.
- Fun fact: this study found citsec provides the best price improvement for the retail investor: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4189239. Tell that to reddit…
- Why don’t all orders go through wholesalers then? Institutional investors will always exist to make better-informed trades. These have to go somewhere. Exchanges bear the majority of this volume, and its associatively higher risk (for the exchange), so the spreads in that location correspondingly increase.