Rewards programs also seem to offer a lot, but the card holder gives up much in return.

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Holyrood's out-going presiding officer, Tory, Alex Fergusson, will be the first former holder of the post to return to parliament as an MSP.

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Broadly, instead of using simple supply and demand, it explains changes in the demand for one asset (a small silver coin, say) relative to another (a large coin) in terms of changes in the rate of return that the holder of the assets can expect from each.

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This is because any remedy would require that the sukuk be changed so that the sukuk holder shoulders a risk of loss, or of lower return, in years where the venture did not meet earnings expectations.

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