This is a book about state institutions, political ideology, and the patterns of interaction between the two. It argues, first and foremost, that ideological belief systems imposed unusually deep and powerful constraints on fiscal policymaking and institutions throughout the final two centuries of China’s imperial history. These ideological constraints explain many of the Qing Dynasty’s unique fiscal weaknesses, which eventually had ruinous sociopolitical and economic consequences. Scholars of economic and institutional history have, for the past several decades, distanced themselves from cultural and ideological analysis, but some core features of late imperial Chinese fiscal history cannot be plausibly explained without it. The challenge here is to reintroduce ideology in such a way that makes sense of the Qing’s political and intellectual idiosyncrasies, relative to both other Chinese dynasties and other early modern Eurasian regimes, while also fluidly interacting with the numerous nonideological forces at work in its fiscal politics and institutions.