Urban planning does not simply organise land; it distributes power. Every plan translates an unstable alliance of public authority, private capital, technical knowledge, media pressure, civic resistance and historical memory into spatial form. The city is therefore not the passive result of regulation, but the visible surface of a conflict between interests that rarely possess the same resources, the same language or the same access to decision. What appears as technical rationality often contains ideological preference, economic opportunity and selective information. The planner’s task is not only to draw alternatives, but to understand how information becomes power, how disinformation weakens participation, and how transparency can transform planning from administrative procedure into democratic practice.

Modern urban history makes this conflict legible. Haussmann’s Paris shows the force of autocratic renewal: demolition, infrastructure, hygiene, rent increase, segregation and monumental order appear together, inseparable from the regime that enabled them. Penn Station reveals another condition: when market utility destroys architectural memory, loss can retroactively produce a preservation movement. The struggle between Robert Moses and Jane Jacobs condenses the most contemporary lesson: the growth machine can be interrupted when local knowledge, media action and civic organisation become political force. Urbanism is never only top-down or bottom-up. It is a negotiated, asymmetrical and often violent ecology of powers. Its ethical question is not whether the city changes, but who pays the cost of change, who receives its benefits, and who has the right to speak before the plan becomes irreversible.