Which hardly matters if your product has an excellent price/weight ratio. My understanding (not being involved in the field in any role) is that even car-based

Which hardly matters if your product has an excellent price/weight ratio. My understanding (not being involved in the field in any role) is that even car-based street dealers carry far less product than one could comfortably pack on a bike. And a cargo bike could probably move a quite respectable quantity even by wholesale dealer standards.