Depends on what you mean by rapid growth. For an activity that is already stable at a large volume, any noticeable growth can feel rapid. Further, AirBnB's tin

Depends on what you mean by rapid growth. For an activity that is already stable at a large volume, any noticeable growth can feel rapid. Further, AirBnB's tiny slice of the market could consist of some cohort that would not otherwise participate. CouchSurfers, for example. I used to do CouchSurfing, but I found I preferred paying for AirBnB in some cases. Obviously, now AirBnB is much bigger than its first adopters.