I would invent an app that demonstrates the value of sharing.
There are two modes of interaction between organisms:conflict and cooperation. And the cooperative organisms are more successful - whether it be cooperation between members of the same species or between different species. In fact, if you consider human beings, we only survive because of the cooperative interactions we have with numerous types of bacteria living in and on our body. The app would simply assess your behaviour and how cooperative it is (or not) and tell you how much money you lost out on by not being cooperative.Then maybe people might understand that when two people share, they double their resources. Of course, I'm going to have to wait until true AI turns up to make an app that make such an assessment.