Products, methods and system for guaranteeing the minimum accumulation benefit of an investment account owned by an entity are described. The steps of the guarantee include determining an external index or method to use to calculate the guarantee at the end of the defined investment period; allowing the owner of the investment account to select from available investment options; and at the end of the investment period crediting the investment account the difference of the current value of the investment account and the calculated minimum value of the investment account if the investment account has not increased in value above the calculated minimum.