For example, a national service system may be designed with policies that enable more citizens (the customers of the nation) to become an entrepreneur, and thereby create more innovation and wealth for the nation. Service systems may include payment mechanisms for selecting a level of service to be provided (upfront or one time payment) or payment based on downstream value sharing or taxation derived from customers who received the benefit of the service (downstream or ongoing payment). Payments may also be in the form of credit (creative arts) or other types of intangible value (see anthropological theories of value and theory of value).