开放参观学习啦？
我买过里面的个股，结果长期持有一直under water. 是不是买Index fund 更会跟着大盘走？
是，An index fund is a type of mutual fund or exchange-traded fund (ETF) with a portfolio constructed to match or track the components of a financial market index, such as the Standard & Poor's 500 Index (S&P 500).