Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is Bogleheadism (index fund investing) dead?
The reports of my death have been greatly exaggerated. - Twain I use index funds in my retirement planning, but don't stick to just S&P 500 index funds. Suppose I balance my money 50/50 between Small Cap and Large Cap and say I have $10,000.  I'd buy $5,000 of an S&P Index fund and $5,000 of a Russell 2000 index fund. Now, fast forward a year.  Suppose the S&P Index fund has $4900 and the Russell Index fund has $5200.   Sell $150 of Russell Index Fund and buy $150 of S&P 500 Index funds to balance.  Repeat that activity every 12-18 months.  This lets you be hands off (index fund-style) on your investment choices but still take advantage of great markets.   This way, I can still rebalance to sell high and buy low, but I'm not stressing about an individual stock or mutual fund choice. You can repeat this model with more categories, I chose two for the simplicity of explaining.