So far, there appears to be an endless supply.Most of the people who drive are those have considered to, there isn't an endless supply of drivers and those willing to drive because of advertising.
At least half the world can drive people around all day, there may not be an endless supply but there is a large enough supply to replace their entire force of drivers every year for many years.Most of the people who drive are those have considered to, there isn't an endless supply of drivers and those willing to drive because of advertising.