I am not a sophisticated investor. I just put my 401k monies in a couple indexes (S&P 500, Russell 2000, International Index) and some large broad-based funds managed by my company's 401k.

Question: If so many people are socking most of their savings into S&P Index funds - are there possibilities that there is a bubble for these companies because their stocks are being bought with the other 499 companies? And their stock growth is happening - not necessarily because they are great companies, but because all boats float as the tide rises? What about investing in things besides the S&P 500 or Russell 2000?

Also - what about as the Boomers spend their retirements - what's the prediction for money in-flows / out-flows as a result of changing demographics? What is expected to happen at the macro level as a result?