Example 1: Supply Chain Audit for Amazon FBA Lithium Power Stations [INPUTS] Variable 1: 1,500 units. Master carton configuration: 5 units per carton. Master carton dimensions: 50cm x 40cm x 30cm. Gross weight per carton: 25 kg. Total cartons: 300. Variable 2: Unit cost: $85.00. Total commercial value: $127,500.00. Incoterm: FOB Shenzhen. Variable 3: Ocean freight quote (20ft FCL): $2,100.00. Destination port: Port of Long Beach, CA. Customs bond: $500.00. 3PL Unloading & Palletizing: $45.00 per pallet (assumed 30 cartons per pallet). Domestic drayage: $850.00. Variable 4: Target destination: California, USA. HS Code: 8507.60 (Lithium-ion accumulators). Target Amazon retail price: $249.00. [SIMULATED OUTPUT] Landed Cost Architectural Audit The proposed supply chain architecture for this lithium-based inventory presents severe capital exposure due to Section 301 tariff vulnerability and specialized hazmat handling constraints. Current margin projections are mathematically invalid without accounting for punitive import duties and lithium-specific destination friction. The Friction Ledger Expense Category: Base Inventory Allocation Projected Cost: $127,500.00 Clinical Observation: Baseline capital expenditure; FOB Incoterm confirms origin port loading is absorbed by the supplier. Expense Category: Ocean Freight (20ft FCL) Projected Cost: $2,100.00 Clinical Observation: Freight rate is verified; 18 CBM total volume fits comfortably within a 20ft container footprint. Expense Category: Import Duties & Tariffs (HS 8507.60) Projected Cost: $17,722.50 Clinical Observation: Standard duty is 3.4%, but this code is subject to a 10.9% Section 301 punitive tariff for Chinese origin lithium-ion goods. Total effective duty rate calculated at 13.9%. Expense Category: Harbor Maintenance (HMF) & Merchandise Processing (MPF) Projected Cost: $600.99 Clinical Observation: MPF calculated at maximum cap ($614.35 limit) or standard 0.3464% ($441.66) + HMF at 0.125% ($159.33). Expense Category: Destination Logistics & 3PL Prep Projected Cost: $1,800.00 Clinical Observation: Includes $850 drayage, $500 bond, and $450 palletizing (10 pallets). Missing hazardous materials (DG) handling surcharges at 3PL. Critical Vulnerability Analysis Tariff Exposure: The $17,722.50 duty obligation represents a catastrophic margin bleed. Failure to account for the exact Section 301 rate on lithium-ion batteries invalidates previous unit cost projections. Hazmat Omission: Variable 3 lacks Dangerous Goods (DG) documentation fees and specialized Class 9 Hazmat drayage surcharges. Standard drayage rates ($850) will likely be rejected by the carrier. Incoterm Alignment: FOB Shenzhen successfully shields the operator from origin drayage and terminal handling charges. Unit Cost Reality Check Total Capital Deployed: $149,723.49 Projected Gross Revenue: $373,500.00 True Landed Cost Per Unit: $99.81 Final Strategic Directive Halt capital deployment. The $99.81 landed cost compresses the gross margin to unsustainable levels once FBA fulfillment fees (heavy/bulky tier) and Amazon referral fees (15%) are deducted. Re-negotiate the unit cost to $76.00 to absorb the 13.9% tariff impact, or source the lithium assembly from a secondary market outside of the Section 301 jurisdiction to bypass the punitive tax. Obtain a revised drayage quote explicitly noting Class 9 Hazardous Materials.