Market makers withdraw liquidity during sudden volatility spikes mainly because the costs and risks of standing ready to trade rise sharply. Academic models and empirical studies identify three core drivers: adverse selection, inventory risk, and execution uncertainty. Albert S. Kyle, University of Maryland, formalized how informed trading creates adverse selection pressure that widens spreads and discourages liquidity provision. Maureen O'Hara, Cornell University, showed how market makers reduce quoted depth when price discovery becomes noisy, protecting capital and reputation. Regulatory investigation of the May 6, 2010 flash event by the Securities and Exchange Commission and Commodity Futures Trading Commission concluded that automated withdrawal of liquidity amplified price dislocations, illustrating the practical effects described in theory.
Mechanisms behind withdrawal
When prices move rapidly, market makers face higher probability that immediate counterparties are better informed, so each offer to buy or sell risks a loss if the market continues moving against them. This increases adverse selection costs and triggers automated risk limits inside trading firms. At the same time, volatile markets inflate inventory risk: holding positions during a spike can produce large mark-to-market losses and capital hits. Many liquidity providers use algorithmic rules that automatically pull quotes once volatility or order-flow thresholds are crossed, preferring to pause quoting until conditions normalize. Technology, co-location competition, and tighter real-time risk controls make withdrawal faster than in human-only eras, which is especially consequential in electronic venues.
Consequences and contextual nuances
Withdrawal reduces displayed depth and concentrates trading at wider spreads, producing larger price swings for the same trade size and eroding market confidence. For retail traders and smaller institutional participants, this means difficulty executing orders without adverse price impact. Cultural and territorial factors matter: in more developed markets with many competing high-frequency market makers, liquidity can rebound quickly but may still be brittle; in emerging markets with fewer designated liquidity providers, withdrawals can cause prolonged gaps and economic harm to local investors and issuers. Regulators respond by requiring market-maker obligations, circuit breakers, and improved transparency to balance continuous quoting with prudent risk management. Understanding both the economic incentives of liquidity providers and the human and technological constraints explains why withdrawal is often the rational — if socially costly — response to sudden volatility.