Nigeria, Sept. 18 -- In the first part of this discussion, I examined what Uber's exit reveals about the analogue infrastructure beneath Nigeria's supposedly digital economy. But physical and digital infrastructure are only part of the story. The other question is how effectively Nigeria governs the markets created on top of them.

Uber's experience in Nigeria does not only draw attention to the analogue infrastructure beneath our supposedly digital economy. It also raises a more difficult question: How effectively do we govern the markets created on top of that infrastructure?

Technology can make drivers traceable, journeys recordable, payments transparent and customer complaints easier to investigate. But those capabilities produce bet...