Re: False economy
Indeed, the main reason why the British army in the Napoleonic wars was as effective in a firefight with ranks two deep rather than the European three deep configuration was because the brown bess musket was produced in an early form of standardised mass production and every soldier had one*, with musket balls of the right calibre.
Your European squaddie on the other hand could be equipped with a number of different arms, not necessarily the one they were trained on with not necessarily the right calibre ammunition.
Which meant as many muskets fired effectively in a British 2 rank front than an average European three rank front.
Sure the British troops were also heavily trained but the standardised, reliable equipment played a big part.
*other than those in the rifle sections of course.