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Does anyone know where to look to find out what percentage of US/int'l stocks and bonds are held by index funds?

I'm an indexing proponent, and my entire retirement portfolio save my current 401K is in index funds. But I'm a little concerned that down the road if a significant percentage of all market assets are tied up in index funds, that we're in for a hypersensitive market with fragile prices due to all the indexing people reacting to each other's laziness and not the business fundamentals.

Aren't most market indicies are based on market cap (share price * num shares -- i.e. what people "think" the business is worth) rather than some fundamental measure of the business (book value, cash flow, discounted future cash flow, etc.).

If so, then it intuitively seems to me that this is a problem with indexing. Thoughts?
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