Over time, according to popular and academic accounts, alternative trade initiatives [such as fair trade, organics, forest certification, and socially responsible investing (SRI)] almost invariably lose their oppositional stance and go mainstream. That is, they lose their alternative, usually peripheral, and often contrarian character. In this paper, I argue that this is not always the case and that the path to going mainstream is not always an unproblematic one. I observe that while scholars have documented various aspects of specific alternative trade initiatives, little comparative work has been done to theorize their different trajectories. To advance the scholarship, I compare two alternative trade movements, fair trade and SRI, and develop three hypotheses-the relation motivations hypothesis, the material interests hypothesis, and the organization of credibility hypothesis-that explain why going mainstream has been so hotly contested in the fair trade movement but not the SRI movement. I articulate these hypotheses and evaluate their merits.