Nowadays, people are easy to be lost in free commercial ads, the classic example is the make-up ads. When girls walk in the street, there will be some salesmen come after them and tell them to get free products, so the girls are willing to come to the shop. But then they find that they have been cheated because the salesmen ask them to pay the money to buy another products before they get the free one. There is no free meal. So we need to work hard to get the things we want. In western countr...
