Ted Lee — Freedom Through Knowledge

Production Economics

Wright's Law

Why costs fall every time production doubles — and what it means for the future

C = C₀ · Q−b
Unit cost falls predictably as cumulative output grows

What is Wright's Law?

Wright's Law — also called the Learning Curve or Experience Curve — is an empirical principle showing how production costs tend to decrease as manufacturers gain experience. It was named after Theodore Wright, an aeronautical engineer who first documented it in the context of aircraft production in the 1930s.

The core observation is simple but powerful: with each doubling of cumulative production, the unit cost of production decreases by a constant percentage. As total output grows, cost per unit falls — reliably and predictably.

C = C₀ · Q−b
C = Unit cost after Q units produced
C₀ = Initial unit cost (when Q = 1)
Q = Cumulative production quantity
b = Learning curve exponent (rate of cost reduction)

The exponent b typically falls between 0 and 1. A smaller value means faster cost reductions. For example, a b-value of 0.9 means that for every doubling of production, unit cost falls by roughly 10%. A b-value of 0.8 would mean a 20% reduction per doubling — an 80% learning curve.

The key insight: Costs don't just fall with time — they fall with doing. Every unit produced teaches something. Every doubling of output locks in another round of savings. This is why early movers in manufacturing can become nearly impossible to dislodge.

The Doubling Effect

Using a typical 20% learning curve (b ≈ 0.32) — close to what's observed in solar panels, batteries, and semiconductors — here is how cost per unit falls as production doubles:

Start
1 unit
$100.00
Baseline
1st double
2 units
$80.00
−20%
2nd double
4 units
$64.00
−36% total
3rd double
8 units
$51.20
−49% total
4th double
16 units
$40.96
−59% total
5th double
32 units
$32.77
−67% total
$0 $25 $50 $75 $100 $100 $80 $64 $51 $41 $33 Start 2× 4× 8× 16× 32× Cumulative production doublings →
Each doubling of production reduces unit cost by 20% — illustrating a typical 80% learning curve.

Why Costs Fall With Experience

The cost reductions described by Wright's Law don't happen by accident. Four well-documented forces drive them:

🧠
Learning & Skill
Workers become faster and more accurate with repetition. Errors fall, throughput rises, and waste decreases with every production run.
🔄
Process Optimization
Companies discover better ways to organize workflows, sequence steps, and eliminate bottlenecks as they accumulate practical experience.
📦
Economies of Scale
Higher volumes allow better bulk purchasing, lower material costs, and more efficient use of fixed assets like machinery and facilities.
🔬
Technology Improvement
Accumulated experience drives innovation — better tools, automated systems, and design refinements that reduce cost at every stage.

Wright's Law Across Industries

Wright's Law has been validated across remarkably different industries — wherever production scales, cost curves bend downward.

✈️
Aerospace
Where it all began. Aircraft production costs fell 20% with every doubling of output in the 1930s — and the principle still holds today.
☀️
Solar Panels
One of the most dramatic examples. Solar PV costs have fallen over 90% in the last two decades, tracking Wright's Law almost precisely.
🔋
Batteries (EV)
Lithium-ion battery costs have dropped roughly 18% with every doubling — making electric vehicles increasingly cost-competitive.
💻
Semiconductors
Chip production follows a steep learning curve. Processing power per dollar has roughly doubled every 18 months for decades.
🏭
Manufacturing
From steel to automobiles, learning curves guide production planning and competitive strategy across all heavy industry.
🏥
Healthcare
Surgical procedures, drug manufacturing, and medical device production all follow experience curves as volume and expertise accumulate.
For investors and planners: Wright's Law gives a framework to estimate where costs will be as production scales. Industries that are early in their learning curve — like green hydrogen or solid-state batteries — may follow the same steep descent that solar already has.

Learn More About XNS

XNS applies the principles of both Wright's Law and Metcalfe's Law to decentralized data infrastructure. As their network scales, both cost efficiencies and network value compound together.

Discover How Our Globally Connected Data Center Works

Find out why XNS is different — and how scale and experience make it stronger every day.

Visit xns.tech →

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Disclaimer: This page is for educational purposes only. It does not constitute financial, investment, legal, or tax advice. Ted Lee is fully retired. All professional licences (mutual funds, insurance, first aid) are no longer active. Always consult qualified professionals before making financial decisions. Past performance does not guarantee future results. All investments involve risk, including loss of principal.