(4)In order to take account of the growing integration in the internal market, it should be possible to merge the DGSs of different Member States or to create separate cross-border schemes on a voluntary basis. Member States should ensure sufficient stability and a balanced composition of the new and the existing DGSs. Adverse effects on financial stability should be avoided, for example where only credit institutions with a high-risk profile are transferred to a cross-border DGS.