Recovery Mode
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Recovery Mode kicks in when the Total Collateral Ratio (TCR) of the system falls below
150%.During Recovery Mode, Troves with a "Adjusted Collateral Ratio" (AICR) below the TCR of the system are eligible to be liquidated as well as those with ICR < 110%.
Stablecoin troves are still safe during recovery mode. Since this uses Adjusted Collateral Ratio, troves with purely stablecoins as collateral are not subject to these conditions due to having a higher AICR. See below for more information on adjusted safety ratios.
Moreover, the system blocks borrower transactions that would further decrease the TCR. New YUSD may only be issued by adjusting existing Troves in a way that improves their collateral ratio, or by opening a new Trove with a collateral ratio
>=150%. In general, if an existing Trove's adjustment reduces its collateral ratio, the transaction is only executed if the resulting TCR is above
150%.A trove's Adjusted Individual Collateral Ratio or AICR is a ratio between collateral and debt giving additional weight to stablecoins.
ARAV = Adjusted_Safety_Ratio * Price * Collateral_Amount
AICR = ARAV / Trove_Debt
This calculation is similar to the Risk-Adjusted Value calculation except with a different ratio for each collateral. Stablecoin collaterals have an Adjusted Safety Ratio of 1.6 while other assets will have System Ratio = Safety Ratio. The idea is that we are comfortable with the full system being backed by low collateral ratio loans against yield-bearing stablecoins. But if YUSD is mostly collateralized by riskier assets, we need a higher dollar value of those assets in the system vs. YUSD issued.
The Total Collateral Ratio or TCR is a number representing system safety and the value of the system collateral vs. the amount of YUSD minted against it. The system will be in "recovery mode" if the TCR is below 150%. This calculation works like the AICR calculations above.
System Collateral Value = Adjusted_Safety_Ratio * Price * Collateral_Amount
TCR = Sum_of_System_Collateral_Values_for_All_Assets / Total_YUSD_Debt
The goal of Recovery Mode is to incentivize borrowers to behave in ways that promptly raise the TCR back above 150%, and to incentivize YUSD holders to replenish the Stability Pool.
Economically, Recovery Mode is designed to encourage collateral top-ups and debt repayments, and also itself acts as a self-negating deterrent: the possibility of it occurring actually guides the system away from ever reaching it. Recovery Mode is not a desirable state for the system.
While Recovery Mode has no impact on the redemption fee, the borrowing fee is set to
0% to maximally encourage borrowing (within the limits described above).By increasing your Adjusted Collateral Ratio to
150% or greater, your Trove will be protected from liquidation. This can be done by adding collateral, repaying debt, or both.You can be liquidated in recovery mode if your Trove's adjusted collateral ratio is smaller than the TCR. In order to avoid liquidation in Normal Mode and Recovery Mode, a user should keep their trove collateral ratio (the normal one) above 110% as well as keeping their adjusted collateral ratio above 150%.
- ICR = Individual Collateral Ratio
- MCR = Minimum Collateral Ratio
- TCR = Total Collateral Ratio
- SP = Stability Pool
Condition | Liquidation Behavior |
ICR <=100% | Redistribute all debt and collateral (minus AVAX gas compensation) to active Troves. |
100% < ICR < MCR & SP YUSD > Trove debt | YUSD in the Stability Pool is offset with the Trove's debt. The Trove's collateral (minus AVAX gas compensation) is shared between stability pool depositors. |
100% < ICR < MCR & SP YUSD < Trove debt | The total Stability Pool YUSD is offset with an equal amount of debt from the Trove. A fraction of the Trove's collateral (equal to the ratio of its offset debt to its entire debt) is shared between depositors. The remaining debt and collateral (minus AVAX gas compensation) is redistributed to active Troves. |
MCR <= ICR & AICR < TCR & SP YUSD >= Trove debt | In this case, the Stability Pool YUSD is offset with an equal amount of debt from the Trove. A fraction of collateral with dollar value equal to 1.1 * debt is shared between depositors. Nothing is redistributed to other active Troves. Since its ICR was > 1.1, the Trove has a collateral remainder, which is sent to the CollSurplusPool and is claimable by the borrower. The Trove is closed. |
MCR <= ICR & AICR < 150% & SP YUSD < Trove debt | Do nothing. Because there is insufficient YUSD in the stability pool to fully offset, this trove is not liquidated |
AICR >= 150% | Do nothing. |
Liquidated collateral lost is capped at
110% of a Trove's debt. Specifically, the dollar value of the collateral sent to the stability pool is a maximum of 110% of the YUSD debt that is offset. Any remainder, i.e. the collateral above 110%, can be reclaimed by the liquidated borrower using the standard web interface.