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Tue 05 May 2004Buying into the concept of sad and happyFeeling down or disgusted? Wait, don't buy or sell anything. And whatever you do, stay away from eBay or other online shopping sites until you cheer up.That's because people tend to pay considerably more for an item when they're sad, claims American psychologist Jennifer Lerner of Carnegie Mellon University. At the same time, she claims, feelings of disgust can lead people to sell things at a lower price than they would otherwise.