Naturally, what's lacking in the territory isn't just rebar and cement, there's a lot more.
For instance, electricity and communication.
These two important 'infrastructure projects' are also severely lacking in materials. Electricity, from the power plant to the user's home, requires various pieces of equipment. For communication, Tang Qing doesn't plan to popularize the quantum communication module in his territory, but only use it for significant companies and institutions such as Myanmar Bank, for the communication between his armies, and for emergency communication in various towns.
The mall can provide industrial equipment, but it cannot provide industrial products, so to complete the establishment of the entire territory's electricity and communication network, purchases from outside are still needed, either buying raw materials for self-production, or buying finished products for self-installation.