Teaching voluntary interaction.
Isn't it incredibly sad that that's something that most people need to be taught?
When the environment is one of voluntary interaction, it's taught by example.
Sadly, the vast majority of people are subjected to coercive rule from a very young age. They learn to take what they want rather than trade for it. To borrow to get what they want rather than save for it.
To believe that their unhappiness is due solely to the actions of others, and that those others deserve to be punished for such an atrocity.