When there are more cabs than people who want to ride, changing the number of cabs will not change the number of cab trips, as all people will immediately take their trip in whatever cab comes up. These are the slow days.
When there are fewer cabs than people who want to ride, changing the number of cabs will change the number of cab trips, as all new cabs will immediately find passengers. These are the busy days.
The cab drivers can’t change the number of passengers available on any given day, but they can influence the number of cabs.
Ignoring logistical complications:
When there are more cabs than people who want to ride, changing the number of cabs will not change the number of cab trips, as all people will immediately take their trip in whatever cab comes up. These are the slow days.
When there are fewer cabs than people who want to ride, changing the number of cabs will change the number of cab trips, as all new cabs will immediately find passengers. These are the busy days.
The cab drivers can’t change the number of passengers available on any given day, but they can influence the number of cabs.
That does make sense. If the ‘on slow days’ and ‘on busy days’ qualifiers were in that post when I read it then I clearly missed them.