Re: Cost of diversification
Since these funds address different aspects of the total market (growth/Inc US stocks vs. international small cap) comparison seems to be apples v. oranges.
I believe that both funds are managed not index. Perhaps a better international (lower ER) might be Total Int. Stk. Index fund (VGTSX) with a .36 ER.
Also VTGLX is an "Admiral" fund requiring at least $250K investment to get the .11 ER (not .13 as stated).
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