In the 1970s HMOs started the rather innovative concept of pricing health insurance on the basis of an individual's health.

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This suggests that, on a daily basis, traders are pricing a historically high level of volatility into option contracts.

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Mr Neil said ministers were confident that they could demonstrate that minimum pricing was justified "on the basis of public health and social grounds".

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They can borrow and lend using the gold-linked currency of denomination, or simply use it as a basis for pricing goods and services.

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But that would require a commonly agreed pricing mechanism and confidence that power producers were not trading on the basis of inside information.

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