Answer:
people standard of liveing was amazing during the roaring 20's and the economy was great homlessness was so low but after the stock market crash in 1929 everyone was destroyed by it homelessness and unemployment skyrocketed
I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.
Wilderness still stood, especially for Crevecoeur, not only as the physical embodiment of a profoundly distributing existential reality that challenged civilized values, but as an internal chaos threatening one's moral and psychological identity. He feels man should embrace land and nature, but recognizes they don't.