I did some thinking on this before replying because how businesses run interests me.
You are combining three ways of looking at this and so the responses are all over the place from different perspectives. Some of my examples will be non-airgun related to avoid the passion people feel about what they own
The first is easy. The value of the brand. I start with this one only to get it out of the way. Name brand cereal at the store cost more than a stores inhouse brand. They may very well be made by the same manufacturer. You as the consumer pay for the brand
The other two are macro and micro economics. I will start with micro because it is again an easy one.
As an example is the crankshaft in a car cast, forged, or billet. Each of those is an engineering decision based on strength and an economic decision based on what is good enough for the application. Chrysler has moved toward powder forging to achieve both
My Hammerli trigger assembly is cast pot metal. Other triggers are CNC produced works of art
Those micro economic decisions are what others are referring to as fit and finish
Macro economics are based on what is the total cost of producing a product and what makes up that cost. From there you can know what the net profit (how much you actually put in your pocket) is after all expenditures. Breaking down those expenditures is where it gets interesting, and without intimate details we have to take a swage approach .
Cost of the building, machinery, and labor for inhouse production. Is it cheaper to do it yourself or contract it. Air Venturi with the Avenger pushes that cost to the foreign manufacturer. Others like FX, Daystate, BSA, Air Arms produce much inhouse which also includes material costs.
How much is sourced from other vendors because those vendors want their cut. Wood stocks from Italy, Daystate electronic triggers computers and chronographs, Lothar Walther barrels, etc .
Look at how some pickup trucks are made today. They cross between the US and Canada multiple times just to make the frame .
Is your business vertically or horizontally integrated.
Carnegie Steel reduced their overhead costs of producing steel by purchasing coal mines to run the furnaces and railroads to both transport the coal and their finished product .
Air Venturi appears to be very vertically oriented. I don't know the relationship of FX to FX-USA but if it is vertical then I can see huge cost savings.
With a horizontally oriented business every person who touches the product before it gets to you raises the price. Since the manufacturer can only sell at what the market can bear at the retail end that reduces their profit.
These small examples of these three components could go on and on, and I have barely skimmed the surface. That is what business degrees and real world experience are for.