Question-Answer (Q&A) forums are gaining popularity as a user-engagement tool to drive traffic on multi-service portals. In a platform market model, demand-side users seek answers from the supply-side users, since such answers can indicate value offered, reduce buyer uncertainty and offer social...

Online health has emerged as a critical component of the healthcare system. This paper empirically investigates how online health platforms create value for patients and doctors and explore how market designs influence value creation. We develop a structural demand and supply model for an online...