I want my kids to make something of themselves. I encourage them to trade rather than share. All kids want what another kid has. If you teach them to share, then the other kid gets what they want, but your kid does not, therefore you are teaching them to lose in the game of life. If you teach them to trade, then you teach them a much more valuable lesson, and both kids are happier. Sharing is better than trading only if you value the happiness of other kids more than your own. The lessons learned from trading rather than sharing will help them to ace that math test!