Traders on the floor of the New York Stock Exchange: even novice investors can grasp the simple logic underpinning the case for diversification. Photograph: REUTERS/Brendan McDermid

Everyone knows the old cliché about not putting all your eggs in one basket. A diversified portfolio might consist of different asset classes such as (...)

The growth rate in Twitter users has fallen in every quarter since Twitter’s market debut 21 months ago.

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