The meaning of monopoly here is that JD has a monopoly on the repair of JD tractors. That is, there cannot be competitors if they require you to use official re

The meaning of monopoly here is that JD has a monopoly on the repair of JD tractors. That is, there cannot be competitors if they require you to use official repair places. It doesn't mean that JD repair centers have a monopoly on the repair of all tractors, or that JD has a monopoly on the market for tractors themselves. It's not meant to imply that it would legally be considered a monopoly.