I have determined the following ratio for the Equity portion of my investments:
30%: Intl Equity
40%: US large cap
30%: US small and mid cap
Now, I have some funds invested in a S&P 500 Index fund with Schwab. However, now the total picture is such that I need to put more funds in the "US small and mid cap" bucket. But, there's no index fund at Schwab which has a good ROI. Is a further diversification advisable?