Don't forget potions. You could easily make use of muggle civilisation's amazing mass production ability by having them automate every step but the ones that need magical power. The magic drain from potion creation is minimal, so one or a few wizards could effortlessly power a production line.
Muggles also happen to be very good at large-scale farming, which could easily be applied to the production of magical ingredients, even rare ones.
Add in wizards' ability to cast permanent enchantments at no cost, and their vast array of utility spells (Vanishing Charms alone would be a godsend for any factory), and you have undreamt-of mass production potential.
Small population sizes aren't an issue when you have two worlds' worth of force multipliers.
New chapter!
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 102.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: