A recent definition is that trading is a dirty trick to blackmail stupid and innocent people. Because people like to try new things, they will sell well; But the novelty of attention will soon disappear, so sales will decline. As long as they think they are buying a bargain, they will buy clothes that they will never wear, and there is no room for furniture. In New Zealand, it may be 3 pence cheaper to buy half a ton of lamb chops at some point, so people rushed to buy refrigerators, only to find that the refrigerators were too small to hold half a ton of New Zealand mutton.