I came across this very cool book
Earn It, Learn It by Alisa Weinstein and I wrote it down for myself for when my DD's old enough to consider this kind of thing.
It kinda talks about how you don't want to pay for your kids to do everyday things, as they should be expected to do that anyway, (kinda like Darcy and Kristin already mentioned), so this is a way for them to explore REAL jobs and learn about them. This is what the review says:
"Children four to 12 select from 50 careers and parents guide them as they choose from more than 950 activities, ranging from "shadowing" a professional archeologist to learning how to analyze products like a UX researcher. In return for completing their career assignments, children get financial compensation (the author leaves the exact amount in the hands of the parent) from parents. Children still complete household duties such as making their beds, but the allowance comes from the "Earn My Keep" tasks only. While the book is a treasure trove of innovative and imaginative activities, readers may wonder how busy kids will find time to add to their already packed schedules. Weinstein asserts, however, that many of the tasks (which are icon-coded by type, from simple to complex) can be managed in small amounts of time."
Anyway, it caught my eye and I thought it was a really cool concept, plus gives kids great projects to do. It's worth a look.