The two sides are now haggling over the additional price America must pay to receive a high-level North Korean visitor to pursue this dialogue.

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Haggling is not about price.

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Moscow has had agreements with Beijing to build a gas pipeline into China since 2002, but the two sides have been haggling ever since over the price of the gas supplies.

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In primitive street markets, plenty of price discrimination goes on, through a mix of haggling and local knowledge.

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Tourists gently haggling with good natured shopkeepers over the price of pashminas rub shoulders with Qatari and Indian families buying everything from traditional garments to giant pots used for cooking traditional lamb dishes.

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