My Graham-based model also excludes tech stocks, and, due to the debt requirements in the model, it essentially excludes financial stocks.

FORBES: Ben Graham's 60-Year-Old Strategy Still Winning Big

Prime brokerages use its VAR model to set margin requirements for hedge fund clients.

FORBES: Risks

Argentina did not choose a pure currency-board model: the government has a thin margin of discretion (working mainly through changes in bank reserve requirements) which it has used, especially to ease strains in the financial sector.

ECONOMIST: No more peso?

Google's Gmail currently lacks a calendar function, and some believe the firm would like to add one - albeit perhaps a limited version that could serve home users well without meeting the requirements of corporate users, thus avoiding a head-on challenge to Microsoft's business model.

BBC: Analysis