Enlightenment thinkers rarely used the word “consumption,” but they spoke incessantly of “luxury,” a multivalent term that became the principal idiom through which writers discussed the moral, social, and political implications of consumption. Controversy over luxury was a proxy for the first modern debate on consumption. The discussion of luxury shifted decisively at the turn of the eighteenth century, when two writers – François Fénelon and Bernard Mandeville – laid the foundations for a vigorous Enlightenment debate. Drawing on ancient and medieval critiques, Fénelon argued that luxury corrupted morals, scrambled the social order, and destroyed states. Mandeville countered by advancing a bold apology for luxury. Far from weakening states, he argued, luxury generated prosperous and powerful nations. Gender would play a key role in the debate that ensued. Whereas critics of luxury like Jean-Jacques Rousseau warned that excessive consumption effeminized men, rendering them unfit for public service, defenders of luxury like David Hume claimed that material well-being was the sign of a civilized society in which men and women frequently interacted. In the second half of the eighteenth century, certain thinkers sought to resolve the debate. Political economists argued that if consumption was directed toward productive ends, wealthy and powerful nations would avoid corruption and endure. Meanwhile, luxury producers incorporated critiques of luxury by designing natural and healthy products. Criticism of luxury did little to slow the pace of consumption.