There are two kinds, that is, promotion, promotion: people invite you to buy things in order to win the lottery, or bid high, and you will get a low discount if you win the prize. The purpose is to ask you to spend money. When you feel cheap, you will tell your friends and family to let others know about this activity, which will promote it. If the jade you draw looks beautiful and doesn't cost much, then it must not be A goods. If there is a charge for this activity, the goods will look good.