As a big family, he can naturally get a lot of respect except self-esteem. On the contrary, people in small families can hardly get any respect except self-esteem, so it can be concluded that the more people in small families are respected in their hearts, and the starting point of being respected is to respect themselves. Therefore, since the self-esteem of people from small families is the only respect that can be earned, it is obviously very valuable.
The word "sale" is more appropriate and can be replaced by "exchange". On the surface, people in big families seem to have exchanged their self-esteem for some resources or opportunities, but in essence they just exchanged their own family resources. If they fail, it is not self-esteem or some inner beliefs that hurt them, just because the family forces don't want to be equal, and the other party can't help each other within its own power. On the contrary, if people in small families are not respected in this exchange, they will stick to their own desires. The end result is not a simple loss of self-esteem. The end result is that this demanding little family will become a dog at the feet of others.