My son’s name is Max. He is keen on reading any types of books, but especially history. Sometimes, he will buy one single book, for example “ How super I am 了不起的我-自我發(fā)展的心理學(xué), those books will benefit studying, building up confidence and formulate a set of effective solutions for his study. Yesterday, on16th of January, Max chose his ninth book this year. He bought other books only 5 days ago, however, these didn’t arrive yet. Max is still thinking of buying more new books to satisfy his reading habit. I agreed that he can order a book by adding an extra clause that he has to write an essay of 600 words for each book. He also agrees with my suggestion. Yesterday, he finished three essays to buy the books he likes. Max asked me: "Mommy, how about my essays? Is three essays enough for three new books? I confirmed: of course. Afterwards, we ordered the books happily and will wait for the book to come one day. Suddenly he said: "Mommy, not enough books as a set of books should count for one essay (we bought a set including ninth book). I wrote three essays. I should buy extra two." Then I am not happy and pointed out he already bought lots of books and there are stacks of books in every corner of our house. You can first finish reading them, then we continue to buy. He feels disappointed. I told him that he spends ￥165 in a second and I as his mother can't earn ￥165 per second. The children in the mountains still live barefoot. They do not have enough food or warm clothes...... Then I assigned him a task: He needs to earn 165 yuan within 10 days in some way (this is the goal set for him), he cried and said: "Can I cancel the book order?" Then I told him that you can recommend the book you bought to your drum-playing friends, your family or anyone. You can discount the books you finished and set up a stall downstairs. Since some people like this book, they will naturally buy it, just like you do. Then he caught on and was very happy. He said I could ask anyone to play chess and make a deal that the loser should pay a fee. Children really need to be educated for money, otherwise they do not know the world is sweet and sour.