It is best to have children manage their own money from an early age. When they want something, do not buy them, tell them to learn how to buy the toy,
Are you crazy,if a kid wants a toy you will tell him how to learn to buy a toy,is that what your parents said to you,there are levels in which you implement things to a kid,first and foremost he or she have to understand what you are trying to teach ,making them responsible and aware of things is one thing and asking a kid to think about buying a toy is another. 