We study the optimal execution problem in a principal-agent setting. A client contracts to purchase from a dealer. The dealer hedges, buying from the market, creating temporary and permanent price impact. The client chooses a contract, which specifies payment as a function of market prices; hidden action precludes conditioning on the dealer’s hedging trades. We show the first-best benchmark is theoretically achievable with an unrestricted...

When seeking to trade in over-the-counter markets, institutional investors typically restrict both the number of potential counterparties they contact and the information they disclose (e.g., by requesting two-sided rather than one-sided quotes). We rationalize these important facts in a model featuring endogenous front-running. Although an additional contact intensifies competition and aids in finding a natural counterparty, it also intensifies information leakage—which can be costly if...

We study liquidity supply in fragmented markets. Market makers intermediate heterogeneous order flows, trading off spread revenue against inventory costs. Applying our model to payment for order flow (PFOF), we demonstrate that portfolio-based considerations of inventory management incentivize market makers to segment retail orders by siphoning them off-exchange. Banning order flow segmentation reduces total welfare, can make trading more costly for all investors, and can...