描述几种卖主能使买主相信他们的产品是高质量的方法。哪种办法适用于下列产品:梅泰洗衣机、汉堡

王汉堡包、大钻石？

Describe several ways in which sellers can convince buyers that their products are o[ high quality. Which methods apply in the following products: Maytag washing machines , Burger King hamburgers, large diamonds？