Outside of philosophy, the idea that workers deserve to be paid according to their productive contributions is very popular. But political philosophers have given it relatively little attention. In this paper, I argue against the attempt to use this idea about desert and contribution to vindicate significant income inequality. I claim that the inegalitarian invocation of reward according to contribution fails on its own terms when the following condition holds: the size of each worker's contribution depends on what others only (...) together do. When workers only together make another more productive, that is not reflected in the sum of their own contributions. Thus reward according to contribution recognizes individual accomplishments without recognizing their dependence on collectives, dependence that is, in complex economies, ubiquitous. (shrink)