Aharvard prof. gave this problem to 400 harvard employees (many of whom had advanced degrees) and 250 wharton mbas. most got the answer wrong, so let's see how you do. you have $10,000 to invest in your 401-k plan. here are your only choices: morgan stanley s& p 500 index fund vanguard s& p 500 index fund schwab s& p 500 index fund fidelity s& p 500 index fund all four funds have the same one year, three year and five year returns. "life of fund returns" for each fund are as follows: morgan stanley = 12.5% vanguard = 11.9% schwab = 13.2% fidelity = 14.9% annual fees for each fund are as follows: morgan stanley = 36 basis points vanguard = 10 basis points schwab = 25 basis points fidelity = 27 basis points what is the best way to invest the $10,000? equally split among all four funds. 100% in morgan stanley. 100% in vanguard. 100% in schwab. 100% in fidelity.