Elon Musk has long promised to put a fleet of driverless Tesla “robotaxis" on the roads, but fans and shareholders have been kept waiting. Sunday, the billionaire may finally deliver. His

Musk told CNBC in May that Tesla was experiencing a “major rebound” in demand. A week later an auto trade group in Europe announced sales had plunged by half.

Tesla promises a cheaper robotaxi solution that will be easier to scale than competitors. Accepting this vision comes with several assumptions.