Not going to engage in a discussion of Anglo-French history here, or rise to the bait of who is more qualified. Gets long and involved and (in this case) I suspect it would be un-enlightening.
My point about the Rafale cost - and as I implied it is a French claim, not meant to be definitive in any way - is that there can be extra cost to international collaboration, particularly in the Concorde/Tornado/Typhoon model where everyone is brought to consensus before anything happens. This is why Airbus is not run like Concorde. Certainly Sweden's model gets results cheaper than most people; and France's national model, although not as cheap as that, may have advantages in that it doesn't run into the sort of wrangling that has bedevilled Typhoon. I would also argue that Dassault are in fact no slouches when it comes to R&D.