My son is only 2 so we haven't gotten there yet. But I like the block of tasks that the child has to do with no reward because that is a refection of real life(we all have to take out the trash, mow the lawn, etc).

But in addition to that you encourage the child to think outside of those tasks and to proposal tasks for money/reward mini-business plans. Get them to think entrepreneurial. Then hopefully as they grow older they may petition the neighbors, etc.