The concept of the minimum efficient scale of production
The minimum efficient scale (MES) is the smallest output level at which a firm fully exhausts its economies of scale. At this point, the firm reaches its lowest possible average cost.
Formula
MES = output level where LRAC first reaches its minimum
Real World
In commercial aviation, Boeing estimates the MES for manufacturing a new aircraft model requires producing around 300–400 units — below this, per-unit development and tooling costs remain prohibitively high, explaining why only a handful of firms can compete globally.
Exam Focus
When discussing market structure, connect MES to barriers to entry — a high MES relative to market size limits the number of viable competitors.
Price Elasticity of Demand
PED = % change in quantity demanded ÷ % change in price
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