Consumer-facing firms have developed a wide variety of price discrimination schemes involving coupons, volume discounts, memberships, reward cards, happy hour specials, and so forth.

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Three-time World Memory Champion Ben Pridmore invented a memory system, which he alone has mastered, that allowed him to memorize the precise order of 28 shuffled packs of playing cards in one hour.

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Even while paying off the loan with scratch cards, users pay half as much for each hour of lighting as they did with kerosene.

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This is partly the fault of a primitive banking system: there are no cheques, few credit cards, and paying by bank-transfer means an hour or so in a smelly queue.

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People waited in line for an hour to get Whitman's autograph--she signed collectible "Meg cards, " T shirts, even a forehead--and to bend her ear.

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