BBC NEWS | Business | Buffett warns on investment 'time bomb'

http://news.bbc.co.uk/2/hi/2817995.stm

price of, for example, commodities or shares - without buying the underlying investment. Derivatives generate reported earnings that are often wildly overstated and based on estim
Legendary investor Warren Buffett says shares are still too expensive, while derivatives could turn into a "mega catastrophe" for investors.

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