Joint Production: Why You Can't Scale One Output Without Scaling All of Them

Joint production is an economic concept describing processes that unavoidably produce multiple outputs from a single input. The distinguishing feature: you cannot independently scale one output without proportionally scaling all the others. ## The Core Constraint When one animal, raw material, or process yields multiple products, increasing output of any single product requires increasing the entire production run. Wanting more chicken wings means raising more whole chickens — which floods the market with breast meat. Wanting more diesel means refining more crude oil — which produces more gasoline whether or not gasoline demand has increased. This creates a structural supply ceiling for individual joint products. No amount of demand or price increase for one output can break the physical ratio imposed by the input. A chicken will always have exactly two wings comprising about 5% of body weight, regardless of how much consumers are willing to pay for wings. ## Key Examples **Petroleum refining:** Crude oil yields gasoline, diesel, jet fuel, kerosene, heating oil, asphalt, and petrochemical feedstocks in roughly fixed proportions determined by the crude grade. Refineries can adjust ratios somewhat through cracking and other processes, but cannot produce only diesel. **Meat processing:** A chicken yields breast, thighs, drumsticks, wings, back, neck, and offal. A cow yields dozens of distinct cuts plus leather, bone meal, tallow, and gelatin. Demand shifts for one cut (e.g., wings becoming popular) cannot be met by producing more of that cut alone. **Dairy:** Whole milk yields cream, skim milk, butter, casein, and whey. Skim milk was literally dumped until the 1980s health food movement created demand for low-fat dairy products. **Lumber milling:** A log yields boards of various grades, sawdust, bark, and wood chips. Premium lumber cannot be produced without also producing lower grades. ## Economic Consequences When a byproduct (low-demand joint output) becomes a desired product, its price can spike dramatically because supply is constrained by the production volume of the primary product. This explains the price trajectories of chicken wings, oxtail, pork belly, lobster, and other formerly cheap foods that were once waste or poverty cuts. Why Chicken Wings Inflated 7x While General Prices Only Doubled (2005–2025) Byproduct-to-Delicacy: How Waste Cuts Become Expensive Foods US Oil Refinery Mismatch: Why America Pays $4.59/Gallon Despite Being the #1 Producer