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Liquidation occurs when a user's total borrow has reached a threshold, i.e. the risk factor is greater than or equal to 100%.
Risk factor represents the overall liquidation risk for a given users. When the users add more collateral into the protocol, the risk reduces. Conversely when the users borrow more, the risk increases.
When a user has reached its liquidation threshold, up to 50% (in terms of market value) of the total borrowed asset is sold to the liquidator at a discounted price to repay a portion of the loan.