Economic short stories with analysis

The short story of economics is as follows:

1, tea delivery story Zhang San always likes to drink 20 yuan of tea. Every time Zhang San goes to the newly opened tea shop to buy tea, the boss gives him half a cup of good tea. Zhang San saved tea to entertain the guests. Make a pot of good tea and do nothing all day, but indulge in it. After drinking free good tea, Zhang San doesn't want to drink 20 yuan. No matter how expensive tea he buys, the boss always gives him half A Liang's good tea. Half a year later, Zhang San spent ten times as much money on tea! !

2. A phenomenon observed by airplanes: Passengers aged 30 to 40, first-class passengers often read books, business-class passengers mostly read magazines and work with notebooks, while economy-class passengers read newspapers, watch movies, play games and chat more. At the airport, most people in the VIP room are reading books, while ordinary waiting areas are playing with mobile phones. So, does people's position affect behavior, or does behavior affect position?