GDP, but business lobbyists have stymied even unobjectionable money-raising schemes, such as indexing taxes on cigarettes and alcohol to inflation.

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That long tail includes about a hundred databases of specialized information that the search engine is now working on indexing, such as the Security and Exchange Commission's online filings and the online collection of medical journals known as PubMed.

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With personal accounts, such price-indexing was completely unnecessary, as workers over time would be replacing the promised wage-indexed benefits, which Social Security admittedly cannot finance, with the fully funded personal account benefits financed by real savings and investment.

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She added that the move to the semantic web could pose challenges for established companies such as Google which have grown on the back of indexing documents rather than objects.

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An example of a strategy is fundamental indexing, which is a method of weighting stocks by fundamental factors such as sales and dividends.

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