Commodity

A commodity is any product or service where the buyer doesn't care which supplier provided it. Crude oil, drywall screws, generic cloud compute, transactional email delivery, contract labor at a given skill level. If the customer would swap your unit for a competitor's unit at the same price without hesitation, you're selling a commodity.

When you operate a commodity business, the core problem is a flow problem. You have:

• •Sources - suppliers, warehouses, production lines. Each has a maximum output (capacity) and a Cost Per Unit.
• •Sinks - customers, markets, delivery regions. Each has a Demand level and a price the market sets.
• •Paths - the routes connecting sources to sinks through your operation. Each path has a capacity limit and a per-unit cost.

Your job: move volume from sources to sinks through the cheapest available paths. When a cheap path hits its capacity limit, volume overflows to the next cheapest path. That overflow is where margin erodes.

This is the structure underneath every distribution operation, logistics network, and commodity-heavy P&L. The phrase "sending a commodity from a source to a sink subject to capacity limits" is just a precise way of saying: route volume through a cost-constrained network.

When you sell a commodity, the market sets the price. You cannot charge more because your bolts are shinier. Your entire margin comes from one thing: moving volume through your network at a lower cost than competitors.

This changes what good Operations means. In a differentiated business, you invest in the product. In a commodity business, you invest in the network - cheaper sourcing, better routing, smarter capacity decisions. Your competitive moat is operational efficiency, not differentiation.

The P&L impact is direct and large:

• •Commodity margins are thin - often 5-15% of Revenue
• •A 10% improvement in routing costs can double your Profit margin
• •Every dollar saved on routing falls straight to the bottom line
• •Conversely, a single misrouted overflow path can eat your entire margin on that volume

If you run a Cost Center with commodity inputs (cloud compute, contractor labor, raw materials), the same logic applies. You're routing spend through capacity-constrained options, and the overflow cost is real money on your Operating Statement.

Step 1: Map your network. Identify every source, every sink, and every path between them. For each path, calculate the all-in cost (sourcing + processing + shipping) and the capacity limit.

Step 2: Rank paths by all-in cost. Cheapest first.

Step 3: Fill cheapest paths first. Route volume through the lowest-cost path until it hits capacity. Then overflow to the next cheapest. Repeat until all Demand is met or supply is exhausted.

Step 4: Calculate the cost of overflow. Every unit on an expensive overflow path could have been cheaper if the upstream path had more capacity. The difference between the overflow path's cost and the constrained path's cost is the Shadow Price of that capacity constraint.

Shadow Price tells you exactly what one more unit of capacity is worth at each bottleneck. This is how you prioritize capital investments in a commodity operation - not by gut feel, but by measuring the cost your constraints are forcing on you.

The connection to capacity: You already know capacity cost is superlinear - scaling 3x often costs 4-5x. In a commodity network, this means expanding a Bottleneck doesn't just cost more than expected, it also has diminishing returns as you shift overflow from the most expensive paths first. Model both sides before committing capital.

Apply commodity flow thinking when:

• •Your product is undifferentiated (or becoming so). If customers are choosing on price alone, you're in a commodity market whether you like it or not.
• •You have multiple sourcing or fulfillment options with different costs and capacity limits. One supplier, one route = no routing decision. Two or more = commodity flow problem.
• •Capacity limits at any stage force tradeoffs. If you're saying "we're limited by X, so we have to use the more expensive Y," that's overflow. Quantify it.
• •You need to decide which capacity to expand. Calculate Shadow Price at each constraint before spending capital. Expand the Bottleneck with the highest Shadow Price, not the one that feels most painful.

Do not use this framework when differentiation is your strategy. If customers pay a premium for your specific product, you're not in a commodity flow problem - you're in a Pricing problem. The frameworks diverge.

Commodity flow builds directly on capacity: you learned that capacity cost is superlinear - scaling 3x often costs 4-5x. In a commodity network, this is critical because every capacity constraint forces overflow onto more expensive paths, and expanding that capacity follows the same superlinear curve. The cost of overflow is quantified by Shadow Price, which converts a Bottleneck from a vague complaint into a dollar value per unit. Downstream, commodity thinking feeds into commodity markets (how market-level supply and Demand set the price at each sink), Throughput analysis (what is the maximum volume your network can handle before it hits a binding constraint?), and Cost Optimization strategy. The key mental model shift: in a differentiated business, you optimize the product. In a commodity business, you optimize the flow. Your Unit Economics depend not just on what you pay for inputs, but on which path each unit takes through your operation.