A corollary to this: a stock price can double with only a relatively small number of shares changing hands, proportional to the total number of existing shares.

A corollary to this: a stock price can double with only a relatively small number of shares changing hands, proportional to the total number of existing shares. Comparing the number of Airbnb units to the number of housing units citywide can lead to the wrong implication, even if that percentage is low.