(15)Whereas the retention in the Community of schemes providing levels of cover higher than the harmonized minimum may, within the same territory, lead to disparities in compensation and unequal conditions of competition between national investment firms and branches of firms from other Member States; whereas, in order to counteract those disadvantages, branches should be authorized to join their host countries' schemes so that they may offer their investors the same cover as is provided by the schemes of the countries in which they are located; whereas it is appropriate that, in its report on the application of this Directive, the Commission should indicate the extent to which branches have exercised that option and any difficulties which they or the investor-compensation schemes may have encountered in implementing those provisions; whereas the possibility that home Member States' schemes should themselves offer such supplementary cover, subject to the conditions such schemes may lay down, is not ruled out;