The Tragedy of Your Upstairs Neighbors: Is the Airbnb Negative   Externality Internalized?
  A commonly expressed concern about the rise of the peer-to-peer rental market Airbnb is that hosts---those renting out their properties---impose costs on their unwitting neighbors. I consider the question of whether apartment building owners will, in a competitive rental market, set a building-specific Airbnb hosting policy that is socially efficient. I find that if tenants can sort across apartments based on the owners policy then the equilibrium fraction of buildings allowing Airbnb listing would be socially efficient. 
John J. Horton
q-fin.GN