Digital platform-based marketplaces often have a wide variety of amateurs working alongside professional enterprises and entrepreneurs. Can a platform owner alter the number and mix of market participants? I develop a theoretical framework to show that amateurs emerge as a distinct type of...

This paper studies the willingness to become an entrepreneur depending on an individual's composition of human and social capital. Our theoretical analysis is an application and extension of Lazear's (2005) jack-of-all-trades theory. Our primary implication is that it is not individuals with a...