in some states you have to be 14, 15 or 16 to work. But at gas stations or places that sell cigarettes and alcohol you have to be 18 so if you are a teenager you cannot work at this place. I will be 17 in June and I live in Florida so I got a job at Checkers a few days ago because they're hiring age is 16 and in Florida you have to be 14 and during school you have to have a work permit. those are just for public but there is not a certain age for when you go around and mowing people's yards, shoveling driveways, raking leaves etc
While a market economy has many advantages, such as fostering innovation, variety, and individual choice, it also has disadvantages, such as a tendency for an inequitable distribution of wealth, poorer work conditions, and environmental degradation.