Portfolio Insurance Crash

Algorithm

The Portfolio Insurance Crash, originating in October 1987, demonstrated systemic risk amplification through dynamic hedging strategies. Specifically, option-based portfolio insurance, designed to lock in gains and limit downside exposure, relied on the continuous sale of futures contracts as market prices declined. This selling pressure, when triggered across numerous institutions simultaneously, created a negative feedback loop exacerbating the initial downturn, and liquidity evaporated as market makers withdrew from providing price discovery. The event highlighted the procyclical nature of such strategies and the potential for model-driven behavior to overwhelm fundamental market forces, particularly within nascent derivative markets.