Recovery Mode
What is Recovery Mode?
Recovery Mode kicks in when the Total Collateral Ratio (TCR) of the system falls below 150%. Recovery mode is one of the mechanisms that is designed to protect the integrity of Meridian, maintain adequate liquidity and hold the USD peg for USDM.
During Recovery Mode, Troves with a collateral ratio below 150% can be liquidated.
Moreover, the system blocks borrower transactions that would further decrease the TCR. New USDM 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%.
What is the Total Collateral Ratio?
The Total Collateral Ratio or TCR is the ratio of the Dollar value of the entire system collateral at the current ETH:USD price, to the entire system debt. In other words, it's the sum of the collateral of all Troves expressed in USD, divided by the debt of all Troves expressed in USDM.
What is the purpose of Recovery Mode?
The goal of Recovery Mode is to incentivise borrowers to behave in ways that promptly raise the TCR back above 150%, and to incentivise USDM 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.
What are the fees during Recovery Mode?
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.
How can I make my Trove safe in Recovery Mode?
By increasing your collateral ratio to 150% or greater, your Trove will be protected from liquidation. This can be done by adding collateral, repaying debt, or both.
Can I be liquidated if my collateral ratio is below 150% in Recovery Mode?
150% in Recovery Mode? Yes, you can be liquidated below 150% if your Trove's collateral ratio is smaller than 150%. In order to avoid liquidation in Normal Mode and Recovery Mode, a user should keep their collateral ratio above 150%.
How do liquidations work in Recovery Mode?
ICR = Individual Collateral Ratio
MCR = Minimum Collateral Ratio
TCR = Total Collateral Ratio
SP = Stability Pool
Condition
Liquidation Behaviour
ICR <=100%
Redistribute all debt and collateral (minus ETH gas compensation) to active Troves.
100% < ICR < MCR & SP USDM > Trove debt
USDM in the Stability Pool equal to the Trove's debt is offset with the Trove's debt. The Trove's ETH collateral (minus ETH gas compensation) is shared between depositors.
100% < ICR < MCR & SP USDM < Trove debt
The total Stability Pool USDM 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 ETH gas compensation) is redistributed to active Troves.
MCR <= ICR < 150% & SP USDM >= Trove debt
The Stability Pool USDM is offset with an equal amount of debt from the Trove. A fraction of ETH 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 < 150% & SP USDM < Trove debt
Do nothing.
ICR >= 150%
Do nothing.
How much of a Trove's collateral can be liquidated in Recovery Mode?
In Recovery Mode, liquidation loss is capped at 110% of a Trove's collateral. Any remainder, i.e. the collateral above 110% (and below the TCR), can be reclaimed by the liquidated borrower using the standard web interface.
This means that a borrower will face the same liquidation “penalty” (10%) in Recovery Mode as in Normal Mode if their Trove gets liquidated.
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