A logistics and warehouse system connects suppliers, factories, ports, distribution centers, stores, and customers into one coordinated supply chain. Its purpose is to move the right product to the right place at the right time while controlling cost, speed, and reliability. Warehouses are not just storage buildings because they also sort, pick, pack, track, and route goods.
Understanding these systems helps explain how online orders, grocery shelves, manufacturing parts, and emergency supplies reach people efficiently.
A supply chain works through two linked flows: physical goods moving through facilities and information moving through software systems. Inventory data, demand forecasts, shipping schedules, and scanning events help managers decide when to reorder, where to store items, and which transport mode to use. Warehouse performance is measured with quantities such as throughput, cycle time, fill rate, and inventory turnover.
Better coordination reduces delays, stockouts, excess inventory, and wasted transportation.
Key Facts
- Inventory balance: Ending inventory = Beginning inventory + Receipts - Shipments
- Throughput rate: Throughput = Units processed / Time
- Order cycle time: Cycle time = Delivery time - Order placement time
- Inventory turnover: Turnover = Cost of goods sold / Average inventory
- Reorder point: ROP = Demand during lead time + Safety stock
- Warehouse utilization: Utilization = Used storage capacity / Total storage capacity
Vocabulary
- Supply chain
- A supply chain is the connected network of organizations, people, facilities, vehicles, and information systems that move products from raw materials to customers.
- Distribution center
- A distribution center is a warehouse designed to receive goods, process orders, and quickly ship products to stores or customers.
- Inventory
- Inventory is the stock of materials, parts, or finished goods held by a business for future use or sale.
- Lead time
- Lead time is the time between placing an order and receiving the goods or completing the process.
- Fill rate
- Fill rate is the percentage of customer demand that can be shipped immediately from available inventory.
Common Mistakes to Avoid
- Confusing inventory with throughput is wrong because inventory is what is stored at a moment, while throughput is how much moves through the system over time.
- Ignoring lead time is wrong because reorder decisions must account for the delay between ordering and receiving stock.
- Assuming the fastest shipping option is always best is wrong because logistics decisions must balance speed, cost, capacity, reliability, and customer need.
- Counting only the movement of goods is wrong because information flow, such as scans, forecasts, and order data, controls many warehouse and transportation decisions.
Practice Questions
- 1 A warehouse begins the day with 1,200 units, receives 450 units, and ships 780 units. What is the ending inventory?
- 2 A distribution center processes 9,600 packages in an 8 hour shift. What is its throughput rate in packages per hour?
- 3 A store sells 80 units per day, supplier lead time is 5 days, and safety stock is 120 units. What reorder point should the store use, and why does this help prevent stockouts?