My son is about 13. A year ago, he decided to clean the balcony from unnecessary garbage, and at the same time to teach his son to quite legal ways of earning. I installed a local advertising board app on his phone. He showed how to use, explained that in order to have more chances to sell, he described in detail and attached more photos from different angles to the ad. He agreed to keep all the money he received. He has to do all the negotiations on his own. During the following several months, bicycles, old sanitary equipment, dead phones, self-driving cars, plugs and so on were sold. He told his wife not to touch his son or money in any case. For the money he collected, he chose a new phone for himself, and safely bought it, adding a little money from birthday gifts. As a result, he learned to talk and explain to foreign adults some details about the things sold. He gave him a sense of ownership that what he earned was his own. He decides how to spend that money. He instilled the power of will to save money, rather than run away and spend immediately on all sorts of nonsense. Release the balcony.