Sorry but what goods are more durable than a pill and cannot be resold?

EDIT: I now understand “durable” to mean “something that lasts long”, whereas I thought it just meant “non-perishable” (ie not fruit or flowers).

Gotta admit I still don’t understand how the original theory resonated with anyone though. I can’t even come up with an example. What monopolist sells a durable good? Games aren't a monopoly. Most other monopolists sell subscriptions or consumables (eg a train ride).