Agree that all that is needed is a “more pay per time period for more efficiency” but think it’s hard to get right.

The cab driver is constantly playing bird in the hand is worth two in the bush - do I take less per minute with this customer but take a long time, or take the customer quickly, get paid more, but then also have the risk I won’t pick anyone up for long enough that I am worse off?

I think most people go for bird in hand is the issue.