Equity Deficit
An equity deficit occurs when a trader's account balance becomes negative, meaning the losses on their positions exceed the total value of their collateral. In traditional finance, this would lead to a margin debt, but in many decentralized crypto protocols, it can lead to bad debt that must be socialized among other users or covered by the protocol's insurance fund.
This usually happens when market volatility is so extreme that the liquidation engine cannot close the position fast enough at a price that covers the debt. An equity deficit is the ultimate failure of a margin system and indicates a breakdown in the protocol's risk management or liquidity mechanisms.
Preventing such deficits is the primary goal of setting conservative margin requirements and maintaining deep liquidity pools.