The borrow fee is a pro rata fee taken at each borrow event. The fee is added to the outstanding debt and is paid off when the Borrower makes their first repayment.
The interest rate is the annualized percent your debt will increase each year compounded continuously. Some of the interest paid is returned to the supply pool (90%) while the rest is kept by ARCx.
The liquidation fee is the discount liquidators get when purchasing collateral flagged for liquidation. The liquidation revenue is split between the liquidator and ARCx according to the liquidationArcFee. In the case of self-managed liquidations, 100% of revenue is kept by ARCx. This revenue is then fed back into the supply pool to benefit suppliers.