The ShortDAX® x2 Index (Index) provides two times the opposite performance of the DAX® Index (Underlying Index) on a daily basis plus a rate of interest. This means the level of the Index should rise at double the rate the reference index falls and fall at double the rate the reference index rises. The interest rate added to the Index level is based on three times the rate at which banks in the Euro-zone lend to each other on an overnight basis (as calculated by the European Central Bank).