This case examines the importance of liquidity to financial markets, using the dramatic volatility of mutual fund flows in 2008 as an example. While the case is targeted to MBA students in an investments or portfolio management course, it is also appropriate for an advanced undergraduate course. It is written from the perspective of a fund manager who has experienced significant redemptions in 2008 and is considering whether or not to use ReFlow Management LLC's "liquidity provision" service. The case requires students to examine the nature and magnitude of mutual fund trading costs, how fund flows may induce additional trading and how ReFlow's innovative service attempts to resolve these issues. Through this analysis, students will better understand what is meant by the term "liquidity" and how liquidity, or a lack thereof, can negatively impact portfolio performance.