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Early bird discounts and ribbis

Are early-bird discounts ribbis? For example, "buy before March 1, 10% off", or "tickets $12 in advance, $15 at the door" Inspired by http://myparnasa.com/collecting-interest-ribbis/
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Paying more for an item — Ribis?

I will ask the question using the following scenario: Reuvan wrote a sefer that he was charging for it 50 Shekels. Came along Shimon who wanted to buy the sefer. At that time he didn't have money on ...