长期定投共同基金是最省力的投资方式,以下是Motley Fool最近推荐的共同基金: 1. An S&P 500 Index Fund Let's start with passively managed index funds. The index that the most index-fund dollars are tracking is the S&P 500, which includes 500 of America's biggest companies, together making up about 80% of the U.S. market's overall value. There are lots of S&P 500 index funds to choose from, such as the Vanguard 500 Index Admiral Fund (NASDAQMUTFUND: VFIAX) and the Fidelity 500 Index Fund (NASDAQMUTFUND: FXAIX). Among ETFs, there's the SPDR S&P 500 ETF (NYSEM...