a16z Podcast: Knowledge Builds Technology and Technology Builds Knowledge -- with Joel Mokyr

Episode Summary

Executive Summary: Joel Mokyr argues that the Industrial Revolution was driven less by isolated inventions than by a culture of contestable ideas, reputation, and knowledge circulation—embodied in the Republic of Letters. He connects that system to the internet, open-source communities, and modern innovation, while warning that progress depends on competition, focus, and institutions that reward merit rather than tradition or stagnation.

Main Topics: Knowledge, technology, and the Industrial Revolution (Priority: 5/5): Mokyr explains that breakthroughs like the steam engine depended on prior scientific concepts—such as atmosphere and vacuum—that made invention possible. He frames modern growth as a feedback loop between knowledge and technology. Contestability and skepticism toward authority (Priority: 5/5): A major driver of progress was Europe’s break from reverence for ancient wisdom. Ideas were tested against evidence, math, and logic rather than accepted because of tradition. Republic of Letters as a virtual innovation network (Priority: 5/5): The interview highlights a transnational, informal network of correspondence and publication that spread discoveries, created trust, and formed reputational systems akin to modern online communities. Competition, reputation, and merit (Priority: 4/5): Ideas advanced through competitive markets for ideas, priority disputes, peer evaluation, and reputational incentives. Progress came from open scrutiny and status earned through demonstrated contribution. Weak ties, interdisciplinarity, and progress at the margins (Priority: 4/5): Innovative breakthroughs often come from weak ties across geography and disciplines, where fields recombine. Examples include game theory, behavioral economics, and deep learning borrowing from psychology. Technology, stagnation, and policy tradeoffs (Priority: 4/5): Mokyr argues that avoiding innovation risks stagnation, and that history suggests societies should not preemptively block technologies because of uncertain side effects. He contrasts growth-oriented and stability-seeking societies. Measuring growth in a dematerialized economy (Priority: 5/5): The conversation closes with GDP’s limits: modern innovation often shows up as free services, better variety, and lower transaction costs rather than measurable output prices, causing growth to be undercounted.

Key Arguments: The steam engine required prior conceptual breakthroughs; invention depends on scientific understanding, not just mechanical tinkering. Modern economic growth emerges from a synergy where knowledge produces technology and technology produces more knowledge. Europe’s intellectual shift away from sacred authority toward contestability enabled rapid experimentation and innovation. Trust in the Republic of Letters came from reputation and peer vetting, not from formal institutions or centralized authority. The market for ideas was competitive; rivalry and priority disputes, while messy, helped drive results. Weak ties across distant places and disciplines generated more novel insights than closed, homogeneous networks. Breakthroughs often occur when society concentrates effort on urgent bottlenecks like longitude, smallpox, polio, or climate change. Innovation should not be stopped because technologies often have unintended consequences; stagnation is worse. National income accounting misses much of modern value because free digital goods, variety, leisure, and reduced transaction costs are not well captured by GDP. The internet makes knowledge circulation faster and cheaper than the printing press, but top innovators still tend to cluster in elite institutions.

Data Points: First steam engine introduced: 1712 - Thomas Newcomen’s steam engine in England is used as a starting point for explaining how scientific concepts enabled invention. Century earlier: about 100 years earlier - Mokyr notes the principles behind atmospheric engines were not known a century before Newcomen. Royal Society slogan: in nullius verba - Latin for 'on no one's word,' capturing the era’s emphasis on skepticism and contestability. Approximate institutions concentrated in innovation: a dozen institutions - Mokyr says a disproportionate share of frontier innovation still comes from a small number of elite universities like MIT, Stanford, Caltech, Carnegie Mellon, and Northwestern. Timeframe of major Chinese growth: last 30 years - He contrasts China’s recent growth with earlier stagnation. Period of no Chinese growth/catching up: 1850 to 1950 - Mokyr says China did not meaningfully grow or catch up during this century. Communist period referenced: 25 years - He says communism was even worse for growth during the subsequent period. Historical span of measuring longitude problem: centuries - Longitude is cited as a major long-running problem that society eventually solved through focused effort. Phone comparison timeframe: 20 years ago - He notes cellular phones today do things that phones 20 years ago could not do. Shoe size example: 11.5 - Used to illustrate reduced transaction costs from online shopping.

Pivotal Quotes: "The key word to describe what's happening is contestability." — Joel Mokyr: He explains the intellectual shift away from reverence for ancient wisdom toward testing ideas with evidence. "What is created in Europe is a virtual network." — Joel Mokyr: He describes the Republic of Letters as an informal but powerful system for circulating and vetting knowledge. "The alternative to not innovating is stagnation." — Joel Mokyr: He argues that despite unintended consequences, innovation is necessary to address major problems like climate change.

Implications: Innovation depends on open, competitive, reputation-based networks and cross-disciplinary exchange. For today’s economy, this means protecting experimentation, supporting institutions that reward merit, and updating metrics so we don’t miss the value created by digital and friction-reducing technologies.