A factory that builds modern tractors is a pretty huge investment. It’s very large and has a ton of very expensive robotics. It also has a huge supply chain that delivers a wide variety of parts to the factory for final assembly.
A factory worker, while a lot more skilled than a day labourer working on a farm, does not have access to the kind of capital needed to start a big factory. So how does it happen? The people who have the billions of dollars in capital needed to start the factory aren’t just going to give shares to workers they hire.