Cities can only exist because of the highly developed systems which underlie them, ensuring that energy, clean water, etc. are moved efficiently from producer to user, and that waste is removed. The urgent need to make the way that these services are provided more environmentally, socially and economically sustainable means that these systems are in a state of transition; from centralized to decentralized energy; from passive to smart infrastructure; from toll-free to road pricing. Such transitions are widely studied in the context of the influence of service providers, users, and...