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This is heading towards decreasing marginal returns. Briefly, the MC is close to zero because that is the pavement maintenance cost per trip. Additional trips do not add to the costs of signage; nor to the costs of interest payments. For road transport pricing, the relevant MC is the MC per trip; not per road. Re: medical work, the context I was responding to was Strawman's comments about doctors, and I was was explaining why the market for doctor services does not have the same economic characteristics as the market for road trips. Before criticising me, please read the relevant preceding posts. More generally, for explantions of the monopoly pricing and/or wasteful duplication of infrastructure problems from competition in road provision, see my earlier posts. I do not intend to go through them again.
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