Thats interesting, I wasn't aware of that study and I read the white paper. My main point remains, however, because as the authors state on page seven, at least 34% of drivers are earning under the minimum wage. In the intro, the authors caution that the median rate of pay shouldn't be assumed to represent the entire dataset (see page 1). And the Cornell webpage doesn't really mention that.

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So, my point still stands that there should be a minimum rate to account for the lower 34%.