They also vary the pricing based on current supply and demand. So this implies that they automatically fix the price at a point in time for the small set of dri

They also vary the pricing based on current supply and demand. So this implies that they automatically fix the price at a point in time for the small set of drivers who are registered with uber and 5-10 minutes away. They notify (I assume) "off duty" drivers nearby that the price has gone up and as more drivers get on the road they then re-fix the price for the small set of drivers who are 5-10 minutes away?