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Part A: Assembling the raw materials. All products are different, and require different materials, but bringing all the necessary raw materials together requires a bit of math and coordination so there are no shortage or surplus of items.
Moving products around internally requires an automated conveyor system to minimize waste and improve efficiency. Most of the waste in this step is a result of human error, and computer software systems are designed to eliminate that. Inventory management is a part of logistics that keeps count of everything in a warehouse, and requires immense coordination that is better done by a software system.
Getting the products to stores or shopping centers is the final step and requires branching out the product into many different lines. Transporting the items in bulk by train, ship or semi is usually the preferred method, but again, every product is different and requires a different method. Perishable products like fruit and vegetables are sometimes flown across the world to keep them fresh.