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Make a market on the altitude of a country's highest point. The interviewer trades with you three times: how do you update your bid and ask after each trade?

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Make a market on the altitude of the highest point of a given country. The interviewer will trade with you three times, each time either buying at your ask or selling at your bid, and you want to maximise your profit over the three trades. How do you update your bid and ask after each trade?

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