"Seat-occupying culture" is a common problem in every school. Let's take the library seat occupation as an example to sort out the process of seat occupation:

1. Library seats are scarce public resources, and market participants (students) have exogenous demand for seats. With the expansion of colleges and universities and the increase of students, some previous public resources can no longer meet the needs of students, and the demand greatly exceeds the supply.

2. Scarce resources (seats) cannot be allocated by public price signals. When the ownership of seats is transferred to users (students), resources are allocated spontaneously on a "first come, first served" basis because the allocation rules are not clear.

3. The occupation is almost unpunished, and the marginal cost is almost zero, but the income generated is significant, that is, "the marginal income is greater than the marginal cost".

4. Therefore, rational classmates will try to seize the seat resources as much as possible. Although one ass can't sit for two seats, it will be sold in the form of "black market".

As long as the audience in the first row of the concert stands up, the audience in the back row will be forced to stand up because they can't see the whole audience. Therefore, everyone is forced to "get involved", and students who occupy more seats will have black market transactions, such as "roommates occupying seats".

6, leading to market configuration failure.

Therefore, although the behavior of occupying a seat is immoral, it is "reasonable" from an economic point of view and cannot be completely attributed to "young people have no martial arts!"

However, the existence of "rationality of production" does not mean that we should let it develop wildly.