Well I'm curious what those arrangements are even though they're confidential. The problem of course from our standpoint is that it may cause higher prices since they're two levels of mark-up whereas with other manufacturers who handle the distribution as well, is only one. The other question is does Alaris actually ship or does Kodak ship directly to the end user or resellers like B&H photo? It would be silly to ship product from Rochester New York where Kodak is located to England and then reship it back to New York to sell it through B&H. So it seems that there must be some methodology where Alaris gets a percent of the sale price to the retailer. How much of course as you say is confidential. It all obfuscates an easy analysis of how Kodak prices their film often higher than might seem appropriate.
Kodak Alaris doesn't inventory stock - they do the marketing to local distributors. Eastman Kodak essentially produces to order.
Kodak Alaris are the international marketing partner for Eastman Kodak. In healthy markets there are multiple distributors buying product from Kodak Alaris, and they compete against each other to supply product to retailers.
The distributors tend to specialize in particular market segments - distributors that sell to grocery stores, distributors that sell to pharmacy chains, distributors that sell to big box and "department" stores and yes, distributors that tend to service the remaining photographic retail market. It is those distributors who maintain local inventories, although in these modern times, there probably isn't much warehousing happening.
Whatever retail business you are in, you can check the prices, and most importantly the minimum order quantities, from a number of competing sources, and make your purchasing decision then.
It is for that reason that one of my favourite local retailers has at least in the past (pre-Covid) bought "amateur" film from distributors that were not focused on the photographic market (drugstores or grocery stores, IIRC), because the minimum order quantities and order fulfillment times were advantageous.
Harman and, if I understand things correctly, Fuji approach it in a different way. They enter into multiple
exclusive distribution agreements - one per country/geographic area. They are then at the mercy of those individual distributors, who certainly are in business to add their own profits into the price.
Harman of course is a much smaller producer than Eastman Kodak. Their largest market is the USA. Harman's very existence was threatened when their initial exclusive distributor in the US - Wynit - suddenly and unexpectedly went bankrupt. Who knows how much product was shipped from Harman but never paid for there?
Each entity uses a distribution system that reflects their own circumstances.
Harman does its own distribution in the UK. And in many cases, it is more expensive to buy Ilford products there than it is in the US.
Eastman Kodak does its own distribution of its motion picture products.
Other than those two examples, every photographic film price includes some profit for other distribution entities. It also benefits from any efficiencies or infrastructure that those distribution entities offer. If the UK example is anything to go by, those efficiencies and infrastructure benefits result in lower prices.