Mastering the Four Key Flows in Supply Chain Management

What is a Supply Chain and How Does It Operate?

The operation of a supply chain revolves around different "flows" that move goods, data, money, and transactions through the network. Three common classifications exist: the three‑big flows (logistics, information, cash), the four‑big flows (adding commercial flow), and forward/reverse flows, each describing what moves and in which direction.

Commercial Flow: Order, Contract and Transaction Management

Commercial flow is the starting line of a supply chain; it covers order generation, contract negotiation, and payment processes. Core actions include:

Order creation and confirmation (purchase and sales orders)

Contract negotiation and signing (delivery dates, pricing, payment terms)

Invoice, payment, and receivable confirmation

Example: a manufacturer issues a purchase request, creates a purchase order, confirms terms with the supplier, signs a contract, and only then does the supplier ship goods. If commercial flow is disordered, downstream logistics and cash flow become chaotic.

Commercial flow is often overlooked because many focus on warehousing and transportation. Ignoring it leads to unclear orders, mismatched procurement cycles, and contract disputes. Effective management relies on systems such as CRM, SRM, and contract‑management platforms, with metrics like order fulfillment rate, procurement cycle time, and contract change rate.

Logistics: Material Transportation, Warehousing and Delivery Management

Logistics is the most visible resource‑dispatch process in a supply chain, affecting cost structure, delivery speed, and inventory levels. It consists of two main streams:

Forward logistics : supplier → factory → warehouse → customer, covering transportation, warehousing, inbound/outbound handling, and distribution.

Reverse logistics : customer returns, recycling, repair, and waste reuse. This often becomes a hidden cost‑black‑hole if ignored.

A typical logistics workflow for a manufacturer includes raw material inbound, internal material distribution, finished‑goods storage, outbound shipping, and reverse logistics for returns.

Key logistics metrics are inventory turnover rate, transportation cost ratio, and on‑time delivery (OTD). Optimizing these metrics improves cost efficiency, stability, and supply‑chain resilience.

Cash Flow: Payment, Settlement and Cash‑Cycle Management

Cash flow is the "blood" of a supply chain, ensuring that money moves efficiently between upstream suppliers and downstream customers. Its three core processes are:

Payment process : paying suppliers, logistics fees, storage fees, etc.

Receivable process : collecting payments from customers (cash, credit, installments).

Internal fund allocation : cost sharing, fund transfers, and financial management within the enterprise.

Typical cash‑flow steps for a manufacturing firm include paying suppliers after material receipt, invoicing customers after product delivery, and managing operational expenses such as logistics and salaries while maintaining cash‑flow balance.

Critical cash‑flow metrics include inventory‑turnover days, accounts‑receivable turnover, accounts‑payable turnover, and the cash conversion cycle (CCC = inventory days + receivable days – payable days). A shorter CCC indicates healthier cash movement and stronger financial stability.

Information Flow: Order, Inventory, Planning and Logistics Information Management

Information flow consists of three modules:

Business data flow : transmission of orders, procurement, inventory, and delivery data across sales, purchasing, warehousing, production, logistics, and finance.

Planning and control flow : production planning, material requirements planning (MRP), and supply‑chain forecasting, often automated by information systems.

Monitoring and feedback flow : real‑time tracking, alerts, and performance evaluation such as transport monitoring, inventory warnings, and supplier scorecards.

Key information‑flow metrics are data accuracy, inventory visibility rate, plan achievement rate, and information‑flow timeliness. Effective tools include ERP (integrating order, procurement, inventory, production, finance, and sales data), WMS/TMS (warehouse and transport management), and MES (manufacturing execution). The real value lies in seamless integration among these systems.

Conclusion

All four flows—commercial, logistics, cash, and information—are merely lenses for understanding how a company operates. When these flows are clearly defined and coordinated, the supply chain becomes visible, manageable, and resilient. Aligning them eliminates silos and enables holistic optimization.