The core activity of MZ Trading GmbH encompasses three main areas:
1. **Automotive**: The business area 'Pneu Markt' suggests that the company is active in the automotive industry, specifically in the trade of tires and possibly other automotive accessories.
2. **Real Estate**: The area 'Liegenschaften' implies that the company is active in the real estate market, possibly in the areas of buying, selling, and managing properties.
3. **Consulting**: The business area 'Consulting' suggests that the company offers consulting services in various areas, possibly in connection with the other two core activities.
Overall, the core activity of the company can be described as a combination of trade, real estate, and consulting.