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Payment for Order Flow (PFOF) Retail Arbitrage.

Diagnoses the margin capture mechanics where wholesale market makers pay retail brokers hundreds of millions of dollars for the right to execute blind retail market orders against their own lit inventory.

## Zero-Commission Isn't Free

In the 1990s, buying a stock cost a $15 commission. Today, Robinhood allows you to trade for free. But Wall Street is not a charity. If the retail investor isn't paying for the trade, who is?

### FAQ

**Q: How do "Free" brokerages make billions of dollars?**
A: Payment For Order Flow (PFOF). When a retail investor hits "Buy" on a stock, Robinhood doesn't send that order to the New York Stock Exchange. They auction that order to massive Wholesale Market Makers (like Citadel or Virtu) in hidden "Dark Pools." Retail investors are "dumb money"—they buy randomly and don't pick off trends like predatory hedge funds do. Therefore, Wholesalers are willing to pay Robinhood hundreds of millions of dollars just to intercept those trades. The wholesaler pockets the fractional difference between the Bid and the Ask (the spread), gives a tiny microscopic fraction of a penny back to the retail investor as a legal "price improvement," and walks away with billions in pure, risk-free arbitrage profit without the trade ever seeing the public stock exchange.