The ones that do not pay interest compensate the buyers with a significantly higher redemption value.

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Some people are obsessed with mastering the art of booking affordable plane tickets, from squeezing the maximum redemption value out of frequent flyer miles to sussing out hidden discounts for those travelling with an infant, pet or large musical instrument.

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But its stock isn't listed on an exchange, its redemption price is minimal, and it doesn't appreciate in value, according to the team's website.

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