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Whats to stop people buying up large @ 60c each and in 10 years time when postage costs are $2 re-selling what cost them 60c,for $2?
Inflation increases faster than the price of the stamps so you would lose money and the Post Office gain. That is why they do it. If they lost money they wouldn't do it. Plus they can take the extra money now, invest it and beat inflation with higher earnings, just in case inflation does catch up.