The moat
Scale purchasing, store density, and switching costs for pros who need reliability. Brand as the default warehouse. Efficient scale in many metros.
Pain, risk, or retraining required to leave.
The product gets better as more people use it.
Patents, data, licenses, process knowledge, regulation.
Fixed costs spread over a volume rivals cannot match.
Structural ability to be the low-cost producer.
Pricing power from trust, habit, or identity.