My boy is 10 (upd) so we're not at a point for wage earning jobs yet, but he contributes to the economy of the house with chores. He unloads the dishwasher, loads it with verbal prompts, takes out the trash including taking the big can out to the street and back, gathers and sorts laundry, puts his clothes away, etc. He is more successful at tasks that can be accomplished quickly rather than with sustained effort (sweeping the entire kitchen well is tricky, but he can sweep up a specific spill well), but that might be due to attention.