To have a well-founded understanding of your Mini Supermarket Investment, you must have an understanding of costs, customers' needs, and location. Research residential areas, using sites and local discussions to find where groceries are in short supply. Find a commercial space of at least 400-700 sq ft that is easy to access and has foot traffic. You will be spending money on shelves, chillers, POS software, ceiling lights, miscellaneous, and signage. Your inventory includes perishable and non-perishable items.