Equity, or the idea that one should be compensated according to one’s respective contribution, is a fundamental principle for resource allocation. People tend to endorse equity in a wide range of contexts, from interpersonal relationships to public policy. However, at times, equity might come at the expense of efficiency. What do people do when they must waste resources to maintain equity? In this chapter, we adopt a behavioral perspective on such equity–efficiency trade-offs, reviewing the relevant findings from the social psychology, judgment and decision-making and behavioral economics literature. We show that whereas allocators will often choose to waste in the name of equity, this is not necessarily the case. We review various psychological aspects that affect the allocators’ decision.