I am not sure if this is the right site for a question that asks about the economics of aviation rather than the technical aspects of it, but I couldn't find any other stack exchange site so I am asking this here.
As far as I understand, the reason why commercial aircraft are cheap to travel in is because the operational costs of the aircraft are divided among the many passengers in the flight. A fair share of the maintenance costs come from depreciation of the aircraft and the engine overhaul and inspection. In a business jet, I would assume the cost of fuel and the landing fees are much smaller than that of commercial aircraft and, as a result, do not add much to the cost per seat (since the costs are proportionally smaller - approximately at least). So I suspect that costs such as engine overhaul and aircraft inspection do not scale with aircraft size and are approximately the same for both business jet and large commercial aircraft. As a result, the price that each passenger has to pay is much higher.
I tried looking for a few sources on the internet that confirm this but couldn't find any that show a detailed account of expenses. If this hypothesis is correct, I would appreciate it if you could direct me to a source that compares the operational expenses of any commercial aircraft with a business jet.
So is it safe to say that travelling/ transporting cargo is cheaper in a large aircraft than a smaller one if the fuel efficiency is comparable?