re: How much should I invest in international mutual funds in my 401k?

International dominated for about a decade before QE started. Tough to say that was a marketing gimmick.

That said, you would’ve been better off without it since 2010. There will be a day it will dominate again just like nasdaq has. The fact that we hate it may be a contrarian indicator in and of itself.

I wouldn’t go higher than 10% now unless you have a really good option there.