I believe that pocket money can be different. Another situation, when parents give a child a certain amount of money, knowing where, and with what purpose they will be spent. Another thing, when parents give to their child «pocket money», not even imagining what they can spend. Parents should not, but can give the child the «pocket money»
The reward for a good study can also be different. For a good study of the child can be encouraged peculiar, small gifts. Then the child will increase the incentive to study. But the money a child to give still not worth, because the parents are not always able to trace, where they will spend.