(4)Managers of MMFs should be able to apply a higher haircut than the minimum laid down in Regulation (EU) No 575/2013 where they consider it necessary to ensure that the collateral received as part of reverse repurchase agreements is sufficiently liquid, if the market conditions so require. They should also monitor and revise the amount of the haircut requested to ensure an appropriate level of liquidity, in particular when the amount of the haircut stipulated in Article 224(1) of Regulation (EU) No 575/2013 is revised, or the remaining maturity of assets or other factors related to the viability of the counterparty have changed.