Unjust Authority addresses a systematic weakness in contemporary political theory and philosophy. Most contemporary political theorists and philosophers are unable to explain, vindicate, or justify the authority of the liberal democratic institutions that they live under. Instead, they endorse moralist accounts of the right to rule which require governments to meet impossibly high standards to avoid condemnation as illegitimate usurpers. This is true not just of the dominant Rawlsian mainstream, but of many of its radical critics, whose membership of more critical traditions leaves them sceptical of the value of existing institutions, even where they provide stable, decent rule. The book instead provides a realist account of the authority of liberal democratic rule focused on impersonal rule and regulated democratic competition. It uses groundbreaking work in political economy to explain how, at least reasonably favourable conditions, these two mechanisms can be expected to combine to generate a growing surplus whose fruits will be made widely available. The prosperity and protection provided by liberal democratic rule to most of those it governs forms the basis of its authority, even though the hierarchies and exclusions that remain leave liberal democratic societies a long way from justice. Understanding liberal democratic authority in this way allows us to reassess challenges to it. While anger and even violence may then be acceptable and even appropriate, even peaceful attempts to remove the winners of democratic elections must be condemned.