In the aggregate, I have no idea. I'm sure someone's published something about it.
Anecdotally, the small town I'm from has skyrocketing real estate prices, because any available home gets converted into an Air BnB. I'd say it might be 100% above what it would otherwise be. Where I live now is almost certainly closer to 0% above what it would otherwise be.
My point is the Airbnb factor is cyclical not permanent. I would never buy a place where Airbnb is prominent in the neighborhood
reply