This Handbook is a toolkit for local policymakers and engaged citizens to take new approaches to some of the most pressing political problems. From voting and citizen engagement to investment in shared public goods to e-scooter regulation, this Handbook addresses crucial urban issues from a simple, clarifying point of view. Namely, we think that excessive concentrations of power, whether private or public, inhibit democracy and distort markets. Informed by leading research in economic incentive design, RadicalxChange represents a new “middle path” through the dilemmas of public versus private, left versus right, and market versus design. In this spirit, this Handbook presents three new policies and walks through applications of each to several urban issues.