All the cool kids are doing it. An externality occurs when an activity with a commercial goal creates a positive or negative impact on parties outside of the transaction. The classic example is the manufacturing plant polluting the water with their waste. The community downstream suffers a negative impact. Or consider a drug dealer taking up business alongside the playground at the local park. The neighbors no longer use the public park which is there for their use.

The plant and all those who benefit from its production internalize a gain from not properly disposing of their waste, which pushes out a cost to the people downstream. The dealer accesses a young group of clients internalizing a gain from his location while the neighbors suffer the loss. But what about the other way around? A small group forms a club to advocate literacy. They offer extra help in the local schools and give out scholarships to new high school graduates. They lose their time, which could have been spent on something else, so that the local youth may internalize the gain from extra tutoring. Perhaps a company agrees to locate to a small town under the condition the municipality brings in internet infrastructure. The townspeople internalize the benefit of the corporate relocation.

All this talk seems to suggest there are groups of people who are either on the inside or on the outside. The lines are porous, but exist. What if there were a group who had gotten a bad rap for an extended period of time – and it was considered beneficial to come to their aid in some way? Wouldn’t it make sense to place them in locations where other groups have the knack of externalizing benefits to others? That way, no direct interference messes with the balance in their lives. The positive externalities show up in the serendipitous manner of access.