Scientists differ in the ways they approach their work. Some are happy to follow in the footsteps of others, and continue with work that has proven fruitful in the past. Others like to explore novel approaches. It is tempting to think that herein lies an epistemic division of labor conducive to overall scientific progress: The latter, explorer-type scientists, point the way to fruitful areas of research, and the former, extractor-type scientists, more fully explore those areas. And indeed, it has now long been acknowledged that the social structure of science can play an important epistemic role. Still, philosophers of science have so far failed to produce a model that demonstrates the epistemic benefits of such division of labor. In partic...