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Cover art for Why the printing press, steam engine, and internet followed similar adoption curves

Why the printing press, steam engine, and internet followed similar adoption curves

July 29, 2026 · 10 min

Hugo Vance & Lila Soto

Everett Rogers synthesized 508 diffusion studies in 1962 to identify the S-curve — slow start, fast middle, slow end — common to every major technology. But the lag between invention and widespread productive deployment ranges from 7 years (internet) to 121 years (steam ships), making the curve real but impossible to locate yourself on.

Transformative technologies follow recognizable multi-stage diffusion patterns that recur across centuries and sectors.

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About this episode

Eighty-seven percent of 214 specific, dated tech predictions made by calibrated forecasters between 2014 and 2024 turned out to be wrong. That number opens this episode, and what follows is an honest attempt to understand why the failure rate stays that high even when people know the history. The episode works through three bodies of thinking. Everett Rogers synthesized 508 diffusion studies across disciplines in 1962 and identified the S-curve — slow uptake, rapid spread, slow tail — as a near-universal pattern. But as the conversation makes clear, knowing the shape exists doesn't tell you where you are on it: documented adoption lags range from seven years to 121, a spread that renders the curve almost useless as a forecasting tool. Joel Mokyr's work on the industrial era adds the missing piece. The brakes on technology adoption weren't vague or random — they were structural: labor shortages, regulatory misalignment, the need for complementary organizational redesign. A manager running AI in her morning workflow while her team still operates on 18-month planning cycles is living that same dynamic today. Carlota Perez's installation-and-deployment model ties it together. The compression in diffusion timelines — 16 years for PCs, 7 for the internet, 5 for smartphones, 3 projected for AI — is real. But Perez argues that fast diffusion is the Installation Phase, and the productive restructuring follows a crash, not the hype. The clock is faster. The sequence hasn't changed.

Frequently asked

Do all major technologies follow the same adoption curve?

Yes. Everett Rogers synthesized 508 diffusion studies across anthropology, medicine, and education in 1962 and found the same S-curve every time: slow uptake, rapid middle spread, slow saturation. The five adopter segments — innovators (2.5%), early adopters (13.5%), early and late majority (34% each), and laggards (16%) — approximate a normal distribution.

How long did it take for the steam engine to be widely adopted?

Steam and motor ships took 121 years from invention to widespread productive deployment. Electrification reached only half of American factories after 50 years of availability. These lags were not caused by technical failure but by organizational redesign, skilled-labor shortages, and institutional misalignment — what economic historian Joel Mokyr identified as specific structural brakes.

Why are tech adoption predictions so often wrong?

Tech predictions fail because forecasters conflate capability with deployment. Rodney Brooks, MIT robotics pioneer and iRobot co-founder, has scored his own predictions annually since 2018; his January 2026 review found forecasts he explicitly labeled pessimistic still proved too optimistic. The recurring error is assuming society reorganizes at the same speed that a technology becomes technically viable.

Is AI adoption really faster than past technology adoption?

Consumer diffusion of AI tools is compressing — personal computers took 16 years to reach 50% penetration, the internet took 7, smartphones 5, and AI tools are projected at roughly 3. But Carlota Perez's Installation/Deployment model warns that fast diffusion reflects speculative capital flooding in, not productive restructuring, which historically follows only after a financial crash.

What is the difference between technology diffusion and technology transformation?

Technology diffusion measures how widely a tool is adopted; transformation measures whether institutions, workflows, regulations, and labor markets have restructured around it. A logistics firm can deploy AI routing in six months, but insurance frameworks, liability law, and dispatcher retraining still run on pre-AI timelines. Diffusion and transformation run on different clocks.

Grounded in 12 sources
Diffusion of Innovations (3rd edition) · teddykw2.wordpress.com
STRUCTURAL CHANGE AND ASSIMILATION OF NEW TECHNOLOGIES IN THE ECONOMIC AND SOCIAL SYSTEMS · carlotaperez.org
Finance and Technical Change: A Long-term View · carlotaperez.org
Chapter 2 - The Contribution of Economic History to the Study of Innovation and Technical Change: 1750-1914 · cpb-us-e1.wpmucdn.com
Technology Diffusion: Measurement, Causes and ... · dcomin.host.dartmouth.edu
The Overestimate - DEV Community · dev.to
The Coming Wave · dn721906.ca.archive.org
Dr. Robert Li | Technology Adoption Curves and Innovation S-Curves: The Maths Behind AI transformation · drli.blog
Adoption of New Technology · eml.berkeley.edu
Diffusion of innovations · en.wikipedia.org
Why Most Tech Predictions Fail the Same 4 Ways, guptadeepak.com · guptadeepak.com
Technology Di↵usion: Measurement, Causes and Consequences Diego Comin · ineteconomics.org
Read transcript

Lila Soto: Hugo, hey — did you get through that prediction audit before today?

Hugo Vance: I did. Read it twice, actually. The number stopped me.

Lila Soto: Eighty-seven percent. Out of 214 specific, dated predictions — 2014 to 2024 — eighty-seven percent wrong. And I keep sitting with that because these weren't random Twitter takes. These were calibrated forecasters. So, mm, that's what we're getting into today — why tech prediction keeps failing at that scale, and whether the history of how technology actually spreads gives us anything better.

Hugo Vance: Yes. And the failure mode is always the same one. Not capability. Infrastructure. The assumption that society reorganizes at the pace capability advances — that is the recurring delusion.

Lila Soto: Okay but — and this is my actual question — if that pattern is that durable and that visible, why does it keep fooling smart people? Rodney Brooks, MIT robotics, iRobot co-founder, has been publicly scoring his own 2018 predictions every year since. His eighth annual scoring came out January 1st, 2026. Forecasts he explicitly framed as pessimistic — still too optimistic. So pattern literacy isn't the cure, or it would be working. What's underneath that?

Hugo Vance: Well. The pattern is legible in retrospect and invisible in the moment. That's — I'd say that's almost the definition of the problem. Electrification took fifty years to reach half of American factories. Half. And today's forecast says AI reshapes labor markets in three years. That's not a prediction about technology. It's a prediction about regulatory speed, organizational retraining speed — and those clocks haven't compressed.

Lila Soto: Right — but the part that doesn't fit is Brooks himself knowing the history and still overshooting. So what's the smaller question hiding inside yours? Is it that the pattern stays invisible, or that we're choosing not to see it because there's money in the hype?

Hugo Vance: Both, I think. And they reinforce each other in ways that are — you see, that's precisely what makes this durable.

Lila Soto: And that's — okay, that's what makes Everett Rogers so useful here, I think. Because what he actually did in 1962 was pull together 508 diffusion studies — anthropology, rural sociology, medicine, education — and say: here's the shape that keeps showing up. Slow start, fast middle, slow end. The S-curve. Every time.

Hugo Vance: Five hundred and eight studies. That's not a theory. That's a census.

Lila Soto: Right — and the plain-language version is just: every new thing starts as a rich person's toy. Then your neighbor has one. Then it's everywhere. Then your grandmother finally gets one. That arc — slow, fast, slow again — Rogers named five actual slices of it. Innovators, about two and a half percent. Early adopters, thirteen and a half. Then the early majority and late majority, thirty-four percent each. And then laggards, sixteen percent. It's basically a normal distribution laid on its side.

Hugo Vance: Yes. And Rogers built on George Beal and Joe Bohlen — rural sociologists, late 1950s, studying how farmers took up new agricultural practices. That lineage matters. The original data wasn't about gadgets. It was about whether a family planted a different seed variety.

Lila Soto: Which is — mm, that's a different kind of adoption cost than downloading an app.

Hugo Vance: Exactly the problem. Because the S-curve describes the shape beautifully. What it cannot tell you — and this is where I'd push back on anyone using it as a forecasting tool — is where you are on it. The lag data alone spans seven years for the internet to a hundred and twenty-one years for steam and motor ships. That range is so wide it almost invalidates the clock.

Lila Soto: Wait — a hundred and twenty-one years?

Hugo Vance: Steam and motor ships. A hundred and twenty-one years from invention to widespread productive deployment. So knowing the curve exists — knowing it will go slow, fast, slow — tells you nothing about whether you're living in a seven-year story or a century-long one.

Lila Soto: So knowing the shape of the curve doesn't tell you where you are on it — isn't that the whole problem? Like, the map is real but it has no 'you are here.'

Hugo Vance: The map is real and it has no 'you are here' — yes, but here's what breaks the clean version of that. Joel Mokyr, working through 1750 to 1914, found it wasn't just slowness. He found *specific* brakes. Skilled-labor shortages. Institutional misalignment. Infrastructure gaps. Not philosophical fog — actual named obstacles. Which means the lag isn't random. It's structural. And that structure hasn't dissolved.

Lila Soto: Okay but — and I want to press on this — AI tools already live inside existing digital infrastructure. People carry them in their pockets. So isn't the infrastructure prerequisite actually weaker this time? Like, the rails are already there.

Hugo Vance: That's the category error. The brakes Mokyr documented were never about whether the device existed.

Lila Soto: Wait — say that again.

Hugo Vance: The steam engine was operationally viable. The electricity grid got built. The brakes came from organizational redesign, labor retraining, regulatory alignment. Those clocks — I mean, picture it concretely. A manager in 2024, she's got AI running in her morning workflow, genuinely faster, real gain. But her team still runs on eighteen-month planning cycles. Her company still hires on credentials from five years ago. Her regulator still moves like molasses. The tool arrived. The world did not restructure.

Lila Soto: That's exactly — mm, that's Mokyr's brakes, but in a cubicle.

Lila Soto: Which means we might be measuring consumer trial adoption and calling it transformation. Those are different things running on different clocks.

Hugo Vance: General Purpose Technologies — steam, electricity, computing — they diffuse slowly precisely because each sector has to build its own complementary adaptations. The breadth is the reason for the slowness. That hasn't changed.

Lila Soto: And whether the compression from sixteen years to seven to five actually extends to societal restructuring — or only to surface tool usage — that's the question Carlota Perez's installation and deployment model sits right at the center of. That's the part we haven't gotten to yet.

Hugo Vance: And that's — yes, that's the precise place Perez cuts through. Personal computers, sixteen years to fifty percent penetration. Internet, seven. Smartphones, five. AI tools projected at three. The compression is real. I'm not disputing the data. But Perez's model says: that fast diffusion, that speculation, that's the Installation Phase. Financial capital floods in, the bubble builds, the crash comes. And the productive restructuring — the Deployment Phase — that follows the crash. Not the hype.

Lila Soto: So the clock is faster but the phases are the same.

Hugo Vance: The clock is faster. The sequence — installation, crash, deployment — Perez ties that to Kondratiev's long waves, the fifty-to-sixty year cycles. The trough between phases is often a major economic depression. That structure hasn't been abolished by faster diffusion.

Lila Soto: Okay, I'll — yeah, I'll give you that. But what's the smallest version of where I'm still not sure? It's this: the compression from sixteen to seven to five — that's not just enthusiasm. It's cumulative infrastructure, digital connectivity eliminating geographic constraints. Isn't it possible the restructuring lag is also compressing, just slower than the diffusion curve?

Hugo Vance: That would have to show up in the productive deployment data. And it doesn't — not yet. Picture a freight logistics firm in 2023, ships AI routing across its entire fleet in six months. Genuine adoption. But the insurance frameworks for autonomous routing decisions, the liability law, the retraining of dispatchers — those are still running on pre-AI timelines. The tool diffused in months. The institutional scaffolding is a decade behind.

Lila Soto: That's Mokyr's brakes again, dressed differently.

Hugo Vance: It is. And that, I think, is the honest concession I can make here — the Installation Phase runs faster now. Perez would recognize it. But the trough still comes. And what sits on the other side of that trough is the actual productivity gain. We're measuring the fast part and calling it transformation.

Lila Soto: Which means the headline number — three years to fifty percent AI penetration — is real and kind of beside the point at the same time.

Hugo Vance: Beside the point, yes. The adoption curve compressed. The restructuring lag — well, we don't yet have evidence it has. And that gap is where the next hundred years of prediction errors are already being written.

Lila Soto: Here's what I still can't answer after all of this — and I'm genuinely not sure you can either. If the structural brakes on electrification took fifty years to work through American factories even after the technology was proven, and Brooks found in January 2026 that even pessimists were still too optimistic about social change — are we actually in a different era, or are we just in 2005 marveling at broadband while not yet realizing the real restructuring takes twenty more years? I mean, the history doesn't give us a clean answer. I keep turning it over and I don't find one.

Hugo Vance: No. I don't think it does.

Lila Soto: Yeah. That's kind of where we are.

Hugo Vance: Good question to be left holding, at least.

Lila Soto: mm. Good one to have had the company on.