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Wright's Law: An Essential Guide for Investors

Updated: Feb 19

Wright’s Law, also known as the learning curve or experience curve, is an essential concept for investors, particularly those involved in technology, production, and manufacturing sectors. It has profound implications for understanding cost behavior, competitive dynamics, and scalability of various industries.

Introduction to Wright’s Law

First identified by Theodore P. Wright in 1936, this law was a result of his study on the production of airplanes. He discovered that for every doubling of production, the labor requirement was consistently reduced at a predictable rate.

Practical Implications for Investors

  • Predicting Cost Declines: Wright's Law allows investors to forecast how costs will decrease as cumulative production increases. For industries such as semiconductor manufacturing, electric vehicle production, and renewable energy (e.g., solar panels), historical data has supported the predictions of Wright's Law, where costs have fallen predictably as production volumes have increased. Example: In the electric vehicle (EV) industry, the cost of lithium-ion batteries, a significant portion of the EV cost, has consistently declined over the past decade. Using Wright's Law, investors could have anticipated this trend, understanding that as the cumulative production of these batteries doubled, costs would reduce at a predictable rate, thereby boosting the profitability of EV companies.

  • Competitive Advantage: Companies that are ahead on the experience curve benefit from lower costs than their competitors. This can create a competitive moat, especially if the company can leverage its cost advantage to reduce prices or reinvest savings into research and development. Example: A company that has produced 10,000 units of a product might have significantly lower costs than a competitor that has only produced 5,000 units, giving the more experienced company a potential edge in pricing or profit margins.

  • Technology Adoption: As costs fall, new technologies often become more accessible and gain traction more rapidly. Investors can use Wright's Law to anticipate which technologies will likely achieve widespread adoption in the future based on predictable cost declines. Example: The adoption rate of solar panels has increased significantly as their costs have come down. By predicting these cost declines using Wright’s Law, investors could have foreseen the acceleration in solar adoption rates.

Caveats and Limitations

While Wright’s Law has proven useful, it's not infallible:

  • Extrinsic Factors: External events, such as regulatory changes, supply chain disruptions, or global economic conditions, can impact cost trajectories.

  • Diminishing Returns: After a certain point, some industries might see less pronounced cost reductions.

  • Initial Conditions: The starting cost (or time) 'a' and the slope 'b' need to be accurately estimated, which can be challenging.

Wright's Law offers a powerful framework for investors to understand and anticipate cost dynamics in various industries. By leveraging this understanding, investors can make more informed decisions about the future potential of companies and technologies. However, as with all models, it's crucial to be aware of its limitations and to use it as one tool among many in the investment decision-making process.

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