Retail and consumer goods supply chain cases represent roughly 20% of operations-focused interviews at top consulting firms. These cases test your ability to map end-to-end processes, identify bottlenecks, and quantify trade-offs between cost, speed, and service levels.
Why Supply Chain Cases Are Common in Retail Consulting
Retail supply chains are uniquely complex. A typical grocery retailer manages 30,000–50,000 SKUs across hundreds of locations, each with different demand patterns. Consumer goods companies face similar complexity on the manufacturing and distribution side. Based on our analysis of case interviews across MBB and tier-2 firms, supply chain topics appear in three main forms:
| Case Format | What’s Being Tested | Example Prompt |
|---|---|---|
| Cost reduction | Decomposing logistics spend into drivers | “Reduce distribution costs by 15% without impacting service” |
| Service improvement | Balancing inventory investment vs. stockouts | “Stockout rate increased from 2% to 8% — diagnose and fix” |
| Network design | Evaluating trade-offs in warehouse placement | “Should we open a 3rd distribution center?” |
The Supply Chain Process Map
Before diving into any retail supply chain case, establish the end-to-end process. This framework applies to both retailers and CPG manufacturers:
flowchart LR
A[Sourcing & Procurement] --> B[Inbound Logistics]
B --> C[Warehousing & Storage]
C --> D[Production/Assembly]
D --> E[Distribution]
E --> F[Last-Mile Delivery]
F --> G[Returns & Reverse Logistics]
style A fill:#e1f5fe
style C fill:#e1f5fe
style E fill:#e1f5fe
style G fill:#e1f5fe
In our experience working with retail operations cases, candidates who draw this map first — before asking clarifying questions — consistently score higher. The map gives you a structured way to ask “where in this chain is the problem occurring?”
Four Key Analytical Lenses
1. Inventory Optimization
Inventory is the central tension in retail supply chains. Too much ties up capital and increases obsolescence risk; too little causes stockouts that erode customer loyalty.
Key metrics to understand:
- Days of Inventory (DOI): Industry average for grocery is 20–30 days; for fashion retail, 60–90 days
- Inventory Turnover: Cost of goods sold / average inventory
- Fill Rate: Percentage of customer orders fulfilled from available stock
- Safety Stock: Buffer inventory = Z-score × standard deviation of demand × lead time
2. Logistics Network Economics
Distribution costs typically represent 3–8% of revenue for retailers. The key trade-off is consolidation (fewer, larger warehouses = lower fixed costs but higher transportation costs) versus decentralization (more warehouses closer to customers = faster delivery but higher overhead).
3. Demand Forecasting Accuracy
Forecast error directly drives both overstock and stockout costs. In retail, a 10-percentage-point improvement in forecast accuracy can reduce inventory carrying costs by 15–25% based on our analysis of CPG supply chain projects.
4. Supplier and Lead Time Management
Longer lead times require higher safety stock. For consumer goods imported from overseas, lead times of 8–12 weeks are common. Cases often test whether candidates can calculate the cost of switching to a nearer (but more expensive) supplier to reduce lead time variability.
Common Case Archetypes
Archetype A: “Reduce Distribution Costs”
Structure: Start with total logistics spend breakdown (transportation, warehousing, labor, packaging). Then examine each component:
- Transportation: What’s the split between inbound and outbound? Full truckload vs. less-than-truckload? Route optimization potential?
- Warehousing: Utilization rate of existing facilities? Lease vs. own economics?
- Labor: Automation potential? Shifts and overtime patterns?
Archetype B: “Stockouts Are Increasing”
Structure: Diagnose root cause using the supply chain map:
- Is it a demand forecasting problem (unexpected spikes)?
- Is it a supplier reliability problem (late deliveries)?
- Is it an internal allocation problem (wrong products at wrong locations)?
- Is it a replenishment frequency problem (ordering too infrequently)?
Archetype C: “Should We Build/Close a Distribution Center?”
Structure: Compare total delivered cost under different network configurations:
- Fixed costs of new facility (lease, equipment, staffing)
- Variable transportation savings from proximity to demand
- Service level improvements (faster delivery → revenue uplift)
- One-time transition costs and risk
Quantitative Skills You’ll Need
Retail supply chain cases are more math-heavy than average. Prepare for:
| Calculation | What It Tests | Typical Complexity |
|---|---|---|
| Break-even analysis | New warehouse payback period | Medium |
| Total cost comparison | Two supplier scenarios with different lead times | Medium |
| Inventory carrying cost | Annual cost of holding excess stock | Easy-Medium |
| Transportation cost per unit | Route consolidation vs. direct shipping | Medium-Hard |
A standard formula interviewers expect you to know: Total supply chain cost = procurement cost + transportation cost + warehousing cost + inventory carrying cost + stockout cost. Optimizing one component often increases another, so demonstrate awareness of these trade-offs.
Industry-Specific Nuances
Grocery and FMCG
- Perishability creates hard inventory deadlines (fresh produce: 3–7 day shelf life)
- High SKU count with Pareto distribution (top 20% of SKUs drive 80% of revenue)
- Thin margins (2–4% net) make logistics efficiency critical
Fashion and Apparel
- Seasonal demand with long production lead times (6–9 months for overseas manufacturing)
- High markdown risk on unsold inventory (30–50% of items eventually marked down)
- Growing direct-to-consumer channel creates fulfillment complexity
Consumer Electronics
- Short product lifecycles (12–18 months) increase obsolescence risk
- High unit values justify expedited shipping in some cases
- Component supply constraints (semiconductor shortages) create upstream bottlenecks
Key Takeaways
- Always map the end-to-end supply chain process before diving into analysis — this prevents you from solving the wrong problem
- Inventory optimization is about balancing service levels against carrying costs, not simply “reducing inventory”
- Distribution network cases require comparing total delivered cost, not just transportation or warehouse costs in isolation
- Quantify trade-offs explicitly: “reducing lead time by 2 weeks costs $X more per unit but saves $Y in safety stock”
- Retail sub-sectors have fundamentally different supply chain dynamics — grocery (perishability), fashion (markdowns), electronics (obsolescence)
- Demonstrate awareness that supply chain improvements often involve cross-functional decisions affecting procurement, marketing, and finance
Practice With Real Cases
Explore retail industry cases and consumer goods cases in our case library to apply these frameworks. For structured problem-solving practice, review the operations case framework guide and cost reduction framework. When you’re ready for live practice, try our AI Mock Interview to get real-time feedback on your supply chain case performance.