Service system designers or architects often seek to exploit an economic complementarity or network effect to rapidly grow and scale up the service. For example, credit cards usage is part of a service system in which the more people and businesses that use and accept the credit cards, the more value the credit cards have to the provider and all stakeholders in the service system. Service system innovation often requires integrating technology innovation, business model (or value proposition) innovation, social-organizational innovation, and demand (new customer wants, needs, aspirations) innovation.