"Watch your pennies, and your dollars will watch themselves." It's one of the first rules of finance that we learn as children. And while it may sound trite, it contains plenty of truth and wisdom.
I can recall first hearing the "Penny Rule" as a kid, and thinking it'd be a good idea to test it out with my paper-route earnings. A short time later, I saw firsthand how greatly it lesson could be expanded during a conversation with my dad.