It's psychology. Let's say two people want to buy something, and they both raise half a dollar each bid. Inside their head, they will be going "Oh, another half dollar is nothing", so if they start at 5 dollars, they might end up stopping at 20 dollars, because it never feels particularly more expensive. However, if one of them goes straight from 5 dollars to 15 dollars, the other bidder might not feel like overbidding, because the price had suddenly trippled. So you actually end up saving money. Of course, it's always a bet. The other bidder might've stopped at 10 dollars, you can't know. You need market experience to get a feel for it. |
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