People don't like to lose their original "site" and don't like to lose face. They often fall into a kind of ideological trap, which is what economists call "sinking costs". It refers to an investment of time and money. It can be successfully recovered only after the sale is successful. In English-speaking countries, it is also known as "putting money into a drain. ". What does this text tell us? ['Many people have nostalgia and are not good at giving up.', 'All investment in money and time will pay off.', 'When calculating the investment cost, the "sinking cost" should also be added.', 'When deciding whether to invest, you must forget your past investments.']