There is a man who earns 30,000 yuan a month and marries a wife who earns 8,000 yuan a month. After getting married, the man feels that marriage is very good. Because his wife is very beautiful and does not spend extravagantly, and he only needs to give his wife 3,000 yuan a month for household expenses. This man thinks marriage is particularly cost-effective because he used to spend more than 3,000 yuan each month on his PC.