Supply Chain Management Foundations and Strategic Drivers

This set covers fundamental terminology, mathematical formulas (LaTeX), and key strategic frameworks from the Supply Chain management lecture notes, including forecasting, inventory control, and logistics ecosystem drivers of strategic fit.

Customer Value

The maximum amount a customer is willing to pay based on perceived utility, availability, speed, and convenience.

Supply Chain Cost

The total costs incurred across all network stages to fulfill a customer request, including procurement, production, storage, and transportation.

Supply Chain Profitability

The total profit pie shared across all supply chain partners, including suppliers, manufacturers, LSPs, distributors, and retailers.

Supply Chain Management (SCM)

The end-to-end system encompassing all processes, activities, facilities, and flows involved in taking a product or service from raw material to the final customer.

Supply Chain Surplus

The total value generated by a supply chain minus the aggregate cost incurred across all its stages; calculated as $\text{Customer Value} - \text{Supply Chain Cost}$.

Push Processes

Processes initiated in anticipation of customer orders based on forecasts, occurring in an execution environment with uncertainty.

Pull Processes

Processes initiated in response to an explicit customer order, occurring in an execution environment where demand is known.

Postponement

The strategic decision to delay final product differentiation or assembly until actual customer demand is known, shifting the push/pull boundary closer to the end customer.

Strategic Fit

The alignment between a firm's Competitive Strategy (the customer promise) and its Supply Chain Strategy (operational capabilities).

Implied Demand Uncertainty

The specific uncertainty faced by the supply chain due to the customer promise and service attributes defined by the competitive strategy.

Cost-Responsiveness Frontier

The curve showing the lowest possible operational cost for any given level of responsiveness.

Return on Assets (ROA)

A financial metric calculated as $\frac{\text{Net Income} + \text{After-Tax Interest}}{\text{Assets}}$; measures how efficiently a company uses its assets to generate profit.

Cash-to-Cash (C2C) Cycle

The time metric measuring the days between paying suppliers for raw inputs and receiving cash from end customers; calculated as $\text{Days Inventory} + \text{Days Receivable} - \text{Days Payable}$.

Little's Law

A fundamental supply chain relationship expressed as $\text{Inventory} = \text{Flow Rate} \times \text{Flow Time}$.

Cycle Inventory

Inventory that builds up due to producing or purchasing in batches to exploit economies of scale.

Safety Inventory

Buffer stock carried to mitigate demand uncertainty and supply delays.

Sourcing

The assignment of specific supply chain functions—such as production, storage, or delivery—to internal assets or third-party providers.

Forecasting

The process of estimating future customer demand in terms of quantity, timing, and location.

Simple Moving Average (SMA)

A quantitative forecasting method where the forecast is the average of the previous $n$ periods: $F_t = \frac{\sum_{i=1}^n A_{t-i}}{n}$.

Single Exponential Smoothing (SES)

A forecasting method where weights decay exponentially for older observations, calculated as $F_{t+1} = F_t + \alpha(A_t - F_t)$, where $\alpha$ is the smoothing parameter.

Mean Absolute Deviation (MAD)

The average error magnitude measured in physical units, calculated as $\frac{\sum |A - F|}{n}$.

Mean Absolute Percentage Error (MAPE)

A scale-free metric that measures the average error percentage relative to actual demand: $\frac{\sum [|A - F| / A]}{n} \times 100$.

Aggregate Planning

An operational process determining production, capacity, inventory, and workforce levels over an intermediate horizon of 3 to 18 months.

Chase Strategy

An aggregate planning strategy that synchronizes production output with customer demand by constantly adjusting capacity through hiring, layoffs, or overtime.

Level Strategy

An aggregate planning strategy that maintains a constant steady production rate and workforce, using inventory buffers to absorb demand fluctuations.

Sales and Operations Planning (S&OP)

A cross-functional process that continuously reconciles marketing, sales, operational, and financial plans into one consensus operational plan.

ABC Inventory Classification

A method of ranking SKUs by Annual Dollar Usage, where Class A items account for 60–70% of value despite being only 10–20% of SKUs.

Economic Order Quantity (EOQ)

The lot size that minimizes the total annual cost of ordering and holding inventory: $Q^* = \sqrt{\frac{2DK}{h}}$.

Newsvendor Model

Approached for single-period decisions involving perishable or seasonal items where leftover inventory has significant value loss.

Critical Fractile

The optimal cycle service level in a Newsvendor model, determined by $\frac{C_u}{C_u + C_o}$, where $C_u$ is the underage cost and $C_o$ is the overage cost.

Continuous Review (Q System)

A system where inventory is monitored in real-time and a fixed lot size ($Q$) is ordered whenever stock drops to the Reorder Point ($ROP$).

Periodic Review (P System)

A system where inventory is checked at fixed time intervals ($T$) and a variable quantity is ordered to reach a target order-up-to level ($S$).

Risk Pooling

The practice of centralizing inventory or aggregating demand across product variants to reduce relative standard deviation and safety stock.

Total Cost of Ownership (TCO)

A sourcing approach that evaluates suppliers by combining the purchase price with shipping, inventory, quality, and administrative costs.

The Winner's Curse

A phenomenon in auctions where the winning bidder underestimates true costs and submits an unviable low bid, often leading to financial distress.

Buyback Contract

A contract where the manufacturer agrees to buy back unsold inventory from the retailer at a pre-specified salvage price to encourage higher order quantities.

The Bullwhip Effect

The phenomenon where demand order variability amplifies progressively as it moves upstream through the supply chain tiers.

Forward Buying

A retailer practice of purchasing bulk inventory during price promotions to lock in low costs for future sales, which distorts the demand signal.

Vendor-Managed Inventory (VMI)

A coordination structure where the supplier takes full operational responsibility for managing inventory levels at the retailer’s facility.

Collaborative Planning, Forecasting, and Replenishment (CPFR)

A structured multi-stage framework where partners share demand signals and joint plans to build one consensus forecast and execution plan.

3PL (Third-Party Logistics)

Specialized service providers that execute discrete physical logistics functions like transportation and warehousing.

4PL (Fourth-Party Logistics)

A non-asset-based neutral network integrator that orchestrates end-to-end logistics solutions across multiple providers and IT systems.

Central Dispatch Yard (CDY)

A dedicated off-site facility used for inspecting, holding, and loading products onto transport vehicles to reduce factory congestion and transit damage.