Children are a prime target for marketers. Not only do children today have more disposable income at younger ages, but they have significant influence over family purchases. YTV's 2002 Tween Report estimated that Canadian children aged 9 to 14 spend $1.9 billion and influence $20 billion in family purchases per year. Marketing experts call it "pester power," or the "nag factor" -- the ability to get kids to nag their parents to buy a specific product or take them to a specific restaurant. After all, if your child asks you for the latest toy 37 times a day for a week, the odds are that you will eventually give in and buy it.