Liquidity and Financial Market Runs

We model a run on a financial market, in which each risk-neutral investor fears having to liquidate shares after a run, but before prices can recover back to fundamental values. To avoid having to possibly liquidate shares at the marginal postrun price—in which case the risk-averse market-making sector will already hold a lot of share inventory and thus be more reluctant to absorb additional shares—each investor may prefer selling today at the average in-run price, thereby causing the run itself. Liquidity runs and crises are not caused by liquidity shocks per se, but by the fear of future liquidity shocks.