For example, you selected a computer through the network or friends' introduction, so you went to the store to buy it, only to find that the product was either blue screen or crashed. The salesperson kept saying that the computer was not good (of course, whether it crashed or blue screen was a ghost of sales), and then you wavered. This is because sales people began to recommend other products. Of course, if you are not familiar with the recommended product, you should buy it, buy it back and check it online.
This is called transformation.