Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something, return it better shape (filled up, cleaned) than when you got it.
"I'd never given much thought to how I would die, but dying in the place of someone I love seems like a good way to go."
The stock market is driven by human emotions, not by economic fundamentals.