You have two friends, Bob and Charlie. Charlie owes Bob $1000 and he promised that he would pay Bob 6% interest on that money.
You tell Charlie that if he gives you $20, you’ll loan him $1000 to pay off Bob, and he only has to pay you 5% interest on that money instead.
Bob is aware of this, so he might decide to match your offer and also offer Charlie 5% interest instead, because he’d rather Charlie pay him 5% interest than no interest at all.
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