Why Broader Patents Weaken Incentives for Follow-on Innovation

On November 4, 2022, empirical researchers published a working paper on the Social Science Research Network that quantified a structural failure in intellectual property law: when a broad patent is struck down, follow-on innovation by other inventors jumps by up to 50 percent. The foundational bargain of the patent system has always been straightforward, offering inventors a 20-year monopoly in exchange for publicly disclosing their work. But that consensus is fracturing. The evidence now shows that while patents incentivize the initial breakthrough, granting them too broad a scope actively suppresses the cumulative, downstream research that turns raw discoveries into consumer technologies.[5]

The tension lies in what economists call cumulative innovation. Almost no modern technology is an isolated event; progress is sequential. When an upstream inventor holds a patent with an excessively broad scope, they gain the power to tax or block downstream applications they never actually envisioned. As the R Street Institute noted in a 2025 analysis of patent progress, this creates a dynamic where the reward for one generation of scientists becomes a tollbooth for the next.[1]

The core argument against broad patents is rooted in the sequence-of-information problem. As detailed in a 2017 Stanford Technology Law Review paper, "Patent scope is set at the time that a patent is granted, while the information necessary to set and measure patent scope is not obtained until many years later." Because examiners must define the boundaries of a monopoly before the market trajectory is known, they frequently grant claims that are broader than the theoretical ideal necessary to incentivize the original work.[4]

When this happens, the downstream effects are severe. A landmark empirical study by Alberto Galasso and Mark Schankerman, cited in the 2022 SSRN review, used the random assignment of Federal Circuit judges to measure what happens when patents are invalidated. They found that removing patent rights leads to a 50 percent increase in subsequent citations by other parties. This blocking effect is highly concentrated in complex technology fields like medical instruments and telecommunications, where innovation is highly sequential.[5]

Furthermore, data from European Patent Office post-grant oppositions reveals that invalidation increases follow-on innovation by an average of 16 percent across all sectors. This is not merely a matter of competitors copying the original invention; it represents a surge in unique, downstream applications that were previously stalled because the transaction costs of licensing the upstream patent exceeded the joint surplus of the new product.[5]

The strongest counter-argument to this view—often championed by early-stage investors and pharmaceutical developers—is that broad patents are necessary to coordinate downstream investment. Dating back to Edmund Kitch’s 1977 prospect theory of patents, proponents argue that a broad monopoly allows the original inventor to efficiently manage follow-on research, much like a mineral claim allows a mining company to coordinate extraction without wasteful duplication.[5]

In this view, if patent scope is too narrow, competitors will simply invent around the original discovery, engaging in wasteful research and development duplication that adds no real value to society. The RAND Journal of Economics published foundational modeling in 1995 demonstrating that when the incumbent’s innovation gain is large, broad patent scope can actually prevent inefficient entry by imitators. Without broad protection, the argument goes, the original inventor cannot capture enough of the social value of their breakthrough to justify the initial, massive capital expenditure.[2]

However, the empirical record of the last decade has systematically dismantled the idea that upstream patentees efficiently coordinate downstream research. In reality, asymmetric information and rent dissipation render patentees unwilling to license out valuable technologies to potential competitors. When a patent covers a high-value original innovation, the patentee typically blocks follow-on innovation in their own product market to protect their monopoly rents, choosing market control over licensing revenue.[6]

This dynamic is why the World Economic Forum and other global economic bodies have increasingly questioned whether patents, in their current structural form, stifle innovation. The 20-year term length is a blunt instrument, but scope is the actual battlefield. When a patent's claims are interpreted broadly by the courts, it effectively grants the patentee ownership over future discoveries that rely on the original architecture, chilling venture capital investment in any startup that might accidentally infringe.[3]

The transaction costs of navigating these patent thickets are staggering. Firms without freedom to operate are discouraged from pursuing follow-on innovation due to the risk of costly litigation and catastrophic damage payments. Instead of coordinating efficient development, broad patents force downstream innovators to either abandon their research or divert resources into defensive patenting, creating a mutually assured destruction dynamic that benefits patent lawyers more than consumers.[6]

To understand the scale of the friction, consider the maintenance fees required to keep a U.S. patent in force. The United States Patent and Trademark Office charges $1,600 at 3.5 years, $3,600 at 7.5 years, and $7,400 at 11.5 years. While these fees act as a minor filter to clear out low-value patents, they do nothing to narrow the scope of the high-value patents that actively block cumulative innovation. The scope remains locked in, frozen in the exact language drafted years before the technology matured.[6]

The solution is not necessarily to abolish patents or drastically reduce the 20-year term, but to structurally reform how scope is interpreted. Legal scholars have proposed mechanisms for delayed scope setting or ex-post adjustments during litigation, allowing courts to narrow claims once the actual trajectory of the technology is understood. This would ensure that the original inventor is rewarded for what they actually built, rather than what they vaguely anticipated.[4]

Until such reforms are implemented, the mathematical reality remains: broader patents weaken the incentives for follow-on innovation. The 50 percent surge in downstream development that occurs when a broad patent is invalidated is the exact measure of the progress society is currently sacrificing.[5]

The debate over patent scope is a debate over the nature of progress. If innovation were a series of isolated, lightning-bolt discoveries, broad patents would be harmless. But because innovation is cumulative—a slow, iterative process of standing on the shoulders of giants—granting the giant a tollbooth ensures that fewer people will ever make the climb.[6]

As global economies transition toward highly complex, interdependent technologies like artificial intelligence and synthetic biology, the cost of getting patent scope wrong will only multiply. The evidence is clear: to maximize the total volume of human innovation, the law must protect the rights of the second inventor just as fiercely as it protects the first.[6]