I've got my stock/bond/cash AA where I want it (72/22/6), but now I'm researching more about international index funds and feeling like I'm missing the boat. VTSAX has me nicely diversified in the U.S. market, and I sort of thought that since so many companies are basically multinational, that had me covered globally. But the more I read, the more VTIAX seems important too.
I've already moved about 10% of my investments to VTIAX, but I keep reading about people having and recommending 25-50%. But I'm having trouble persuading myself to invest more in an index fund that hasn't performed that well over the last 5-10 years overall, despite having higher dividends than VTSAX. I'm recently FIREd, so I can't just invest new funds in VTIAX; I'd have to sell VTSAX to do it.
So why should I up my VTIAX percentage? And by how much?
Thanks.