18 This means that ECB policies regarding financial stability that serve monetary policy need to be appropriate for maintaining price stability and should not go beyond what is necessary to achieve this objective.19 In principle, therefore, financial stability-oriented instruments can be used if necessary to carry out the basic tasks, but subject to serving the primary objective of price stability and within 4/7  BIS central bankers' speeches  proportionality limitations.
Financial stability and the prudential supervision of credit institutions The other aspect of ECB involvement in financial stability is through the ECB’s prudential supervisory role.