In the onset of the COVID-19 crisis, central banks purchased large volumes of assets in an effort to keep markets operational. We model one such central bank, which purchases assets from dealers to alleviate balance sheet constraints. Asset purchases can prevent market breakdown, improve price...

We develop a tractable model of a limit order market where informed and liquidity investors compete with a professional liquidity provider who has a monitoring advantage. We apply our model to study the impact of exogenous transaction costs and investor patience on trading activity and market...

Latency delays — known as “speed bumps” — slow the execution of orders at an exchange, often to protect market makers against latency arbitrage. We study informed trading in a fragmented market, where one exchange introduces a latency delay on market orders. While liquidity improves at...