When Sunk Costs Help

I love my little sister. After our parents divorced, we became modern day latchkey kids. We spent every weekday afternoon after school hanging out and playing mancala and watching t.v. And, yeah, back then I sort of tortured her, too. But in a loving, big-brother kind of way.

The funny thing is that we grew up into such different people, even though we were raised in the same household. My sister is completely health conscious, hiking all over the place and eating organic foods; but exercise and diet are a constant struggle with me. I'm obsessed with finances and investments, while my sister would rather be doing something, maybe anything, else.