As middle classes in developing countries grow in size and political power, do they foster stable democracies and prosperous, innovative economies? Or do they encourage crass materialism, bureaucratic corruption, unrealistic social demands, and ideological polarization? These questions have taken on a new urgency in recent years but they are not new, having first appeared in the mid twentieth century in debates about Latin America. At a moment when exploding middle classes in the global South increasingly capture the world's attention, these Latin American classics are ripe for revisiting....