In order to achieve zero tracking error, the fund manager must hold exactly the index for every second of the day.

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This process reduces the time needed to order a refill and it eliminates human error in entering the prescription number.

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Ultimately, bottom-up, sustainable liberalisation will have to rely largely on the unilateral action of governments, trying, by trial-and-error, to put their houses in order.

ECONOMIST: International rescue

This so-called fat-finger error occurred when a trader accidentally entered an order to sell a billion shares rather than a million shares.

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The most error-free chain was Chick-fil-A, with fewer than 3 percent order mistakes.

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