Money, it's transportation, it gets you where you want to go. The more you have the faster you can get there. It doesn't make you smarter but you can sure seem like a dummy if you don't know how to watch your pennies. Your kids need to know about money too. Oddly enough, keeping them without money is not the best way to teach them responsibility. You need to be upfront and truthful with your children so they learn the cold hard facts about managing cold hard cash. 

With the knowledge they can learn from having money of their own they will pick up on the fact that money does make the world go around. Even the most idealistic kid can understand that concept when faced with a choice of having or doing without. It's also a good idea to teach your kids what "enough" money is. You don't need a billion dollar mansion to find happiness is a great lesson to know.