What do ordinary factories listed on the market make money from?

On the one hand, capital mainly depends on the consumption of products. Because in order to make money, ordinary factories do a good job in product quality and let consumers recognize it, so they will make money. But other methods can't. They need money and publicity. These ordinary factories haven't. When they reach a certain level, they will become stronger and bigger. After listing, the factory can use the money earned from listing to expand reproduction, which is also a good choice.