Professor Tao wrote a book entitled Economics is a way of life. I remember that the author first heard this sentence at the freshman meeting, and this sentence left a deep impression on the author's memory. It makes the author feel the economics in daily life, discover the mystery of economics and enjoy it, which is quite interesting.

In this article, the author analyzes the economic truth of four phenomena in daily life. In view of my limited knowledge, there are omissions and mistakes, I hope readers will forgive me! These four life phenomena are pedestrians running red lights, bus operation, roadside barbecue stalls and the accumulation of umbrellas in the library.