Supply Chain Management Fundamentals and Strategy
This domain tests whether you can describe a supply chain as a network of nodes, links and flows, use standard reference models, and defend a design choice against competitive priorities. Expect questions that mix vocabulary with a numeric trade-off.
The chain as a system
- Three flows run through every link: materials forward, cash backward, and information in both directions.
- Upstream (tier-n suppliers), internal (plants, DCs), downstream (channels, customers). Each link carries lead time, cost and variability.
- SCOR organises activity into Plan, Source, Make, Deliver, Return and Enable. Level-1 metrics include perfect order fulfilment, order fulfilment cycle time, upside flexibility/adaptability, total supply chain management cost, cash-to-cash cycle time and return on supply chain fixed assets.
Strategic fit
Chopra and Meindl argue that competitive strategy sets implied demand uncertainty, and supply chain strategy sets responsiveness versus efficiency. Fit means high uncertainty pairs with a responsive chain (flexible capacity, buffers, short lead-time suppliers) and low uncertainty pairs with an efficient chain (high utilisation, low inventory, few facilities). The levers are inventory, transportation, facilities, information, sourcing and pricing.
Bullwhip effect
Demand variance amplifies upstream. Four classic causes: forecast updating (demand signal processing), order batching, price fluctuation and forward buying, and rationing with shortage gaming. Countermeasures: share point-of-sale data, move to everyday low pricing, use VMI or continuous replenishment, shorten lead times, and allocate on historical sales rather than current orders.
Worked example: total cost, not unit price
Annual demand 36,000 units. Offshore: price $20.00, freight and duty $2.50/unit, 90-day pipeline. Domestic: price $23.50, freight $0.50/unit, 7-day pipeline. Carrying cost is 25% of unit value per year.
- Offshore inventory = pipeline 36,000 x 90/365 = 8,877 plus 2,000 safety stock = 10,877 units at $5.00 = $54,385. Purchase and logistics = 36,000 x $22.50 = $810,000. Total $864,385.
- Domestic inventory = 690 plus 500 = 1,190 units at $5.875 = $6,991. Purchase and logistics = 36,000 x $24.00 = $864,000. Total $870,991. Offshore wins by only about $6,600, under 1%. A tariff change, a 5% demand-variance increase or a stockout penalty flips the decision, which is exactly the argument for near-shoring or dual sourcing.
Traps that cost marks
Equating supply chain management with transport and warehousing only. Choosing lowest unit price. Assuming SCOR is software. Assuming responsiveness is free. Blaming customers for the bullwhip effect instead of internal policies.