"In terms of economies of scale, please explain then how an MTH UP FEF is about $400 less than Lionel's current FEF?"
Thanks for the holiday wishes, which I extend to all as well.
To me at least, the explanation for the differential(s) in MTH and Lionel prices are relatively simple, despite fact that Lionel sells more of any given item by and large than MTH.
Firstly the volumes are very small for both. Whereas MTH used to and probably still does smaller runs of 50 or 100, Lionel does runs of 500 and 1,000, which are still very low numbers to spread or allocate the overhead of fixed costs such as tooling, packaging, etc. So Lionel's numbers don't really create economies of scale, except perhaps for their sets, which they sell in the thousands or tens of thousands. That's one reason Lionel can underprice MTH on sets, but on virtually nothing else.
Secondly, Lionel is still doing new tooling, unlike MTH at this point. MTH's tooling probably dates mostly to the 1990s and early 2000s when costs were lower. So that's an enormous pricing advantage, since they are reusing tooling that is partially or fully amortized, as compared with Lionel using new tooling for many of their most expensive products.
Thirdly, and very importantly, MTH has to undersell Lionel by price or they will likely be out of business. Lionel's brand recognition, popularity and dealer network, media presence, etc. all dwarf MTH's. Some of this costs money that MTH doesn't have or choose to spend, but I'd guess Lionel's profits are greater to go along with those higher prices. Many luxury brands do not have proportionally higher costs to account for their dramatically higher retail prices, as we all know.
However, there is a difference between "luxury" pricing and gouging. Some think Lionel is gouging. I do not. They are just accounting for their higher costs, innovation and brand leverage in making probably reasonable profits.