In economics, the famous simple model is harold hotelling. Although the result according to Bertrand's model is wrong, it does not prevent it from becoming a classic. Among the marketing models, Professor Xie Jinhong's Probability Goods is very famous in recent years. Because it uses harold hotelling as the basic model, the calculation process is very simple, but the result is great. Professor Xie has been committed to opening up a new world in the field of marketing, so that everyone can have articles. She is one of the earliest scholars in the field of marketing to study advanced sales. Finally, the prospect theory, a classic of psychology at the end of last century, is also simple and interesting. Search this curve, and I'll make it up with the computer tomorrow. Kahneman, the proponent of this theory, won the Nobel Prize in Economics in 2002, right! You are not mistaken! The winner of the economics prize is a scholar in the field of psychology, hahaha. At that time, scholars in the two fields fought for ten years because of some interesting and common gambling phenomena. The psychological field almost shook the foundation of the economic field and made a large group of economists who felt very rational sleepless. Finally, this problem was solved by psychology.