1. No, I'm not claiming no one would use taxicabs or would ever choose taxicabs over Uber; I refer to a series of hypothetical transactions in which an individu

1. No, I'm not claiming no one would use taxicabs or would ever choose taxicabs over Uber; I refer to a series of hypothetical transactions in which an individual would choose Uber over taxicabs in the absence of the government pressuring the system one way or another. 2. The business activity's externalities (e.g. contributing to congestion) could hypothetically be involved in an answer to my question!! While rhetorical, the question does have good answers from time to time. However, in this case, I don't believe the proposed cap is going to be very effective at mitigating those externalities, and the general concept of a "level playing field" is orthogonal to externality mitigation.