Philippe Aghion

Philippe Aghion: Creative Destruction, Made Measurable

In October 2025 the Royal Swedish Academy awarded half the economics prize to Philippe Aghion and Peter Howitt "for the theory of sustained growth through creative destruction," with the other half going to Joel Mokyr. The phrase had waited thirty-three years for that sentence. Aghion had grown up in a Paris household where his mother ran the fashion house Chloé and his father a gallery on the Boulevard Saint-Germain; he recalled being "surrounded by artists, including Karl Lagerfeld." He became instead the economist who turned Schumpeter's slogan into equations that firm-level data could actually test.

The Chloé Household

Aghion was born on 17 August 1956 in Paris. His mother, Gaby Aghion, founded Chloé and is credited with coining the term prêt-à-porter; his father, Raymond Aghion, ran an art gallery on the Boulevard Saint-Germain. Both parents came from Jewish families originating in Alexandria, Egypt, who had relocated to Paris's Quartier latin and later to Neuilly-sur-Seine. It was a house organised around design, commerce and taste — three things that turn out to sit downstream of innovation, the subject that would occupy his life.

Mathematics First

His training was mathematical before it was economic. He graduated from the mathematics section of the École Normale Supérieure de Cachan, now ENS Paris-Saclay, then took a diplôme d'études approfondies in mathematical economics at the Université Paris I Panthéon-Sorbonne, followed by a doctorat de troisième cycle at the same institution. He completed a PhD in economics at Harvard in 1987. The sequence matters: Aghion arrived at growth theory equipped to formalise it rather than merely to describe it.

The Model

He became an assistant professor at MIT in 1987, joined the CNRS as a researcher in 1989, and in 1990 became deputy chief economist at the European Bank for Reconstruction and Development — a front-row seat while post-communist economies tried to rebuild their productive base. In 1992, with Peter Howitt, he published the model that carries their names.

The Aghion–Howitt framework is Schumpeterian endogenous growth theory: innovation is the engine, and each new technology renders its predecessor obsolete. The model introduced the "business-stealing" effect, in which an innovator captures a rival's market and thereby governs firm entry and exit. Ufuk Akcigit's assessment is that the framework "revolutionized the analysis of endogenous economic growth dynamics by enabling back-and-forth between theory and firm-level data." That last clause is the achievement. Growth theory had been elegant and largely untestable; Aghion and Howitt built a version with observable moving parts.

Competition, Traps and the Frontier

He moved to Nuffield College, Oxford and University College London in 1996, then to Harvard in 2002 as Robert C. Waggoner Professor of Economics. Through the 2000s he studied the links between competition, institutions and growth, identifying an inverted-U relationship between the intensity of competition and the rate of innovation. He also worked on the middle-income trap, showing why emerging economies stall short of advanced status: growth driven by capital accumulation hits a ceiling as a country approaches the technological frontier and must switch to growth driven by innovation.

In 2015 he became Centennial Professor of Economics at the London School of Economics and simultaneously took the Chair of Economics of Institutions, Innovation and Growth at the Collège de France. In 2020 he added the Kurt Björklund Chaired Professorship in Innovation and Growth at INSEAD.

The Economist in Public

Aghion has never confined himself to the seminar room. He led an international expert working group whose 2010 report to Minister Valérie Pécresse recommended "balanced governance" for French universities, proposing dual governing bodies modelled on Harvard, MIT, Oxford and Cambridge. He advised the UN High-Level Commission on Health Employment and Economic Growth in 2016 and the World Bank–IMF High-Level Advisory Group on Sustainable and Inclusive Recovery and Growth in 2021, and has served on the executive and supervisory committee and board of trustees of CERGE-EI.

His politics have travelled. A communist sympathiser as a student, he co-signed an appeal supporting François Hollande in 2012, citing "the relevance of the proposed options, in particular with regard to the recovery of growth and employment," and in 2017 declared for Emmanuel Macron. The trajectory has drawn fire: AOC Media criticised him for "techno-optimism, an attachment to GDP growth as the headline indicator, and a limited understanding of the contemporary multi-factor environmental crisis."

Why Philippe Is Called a Genius

The quality on display is formalisation — the ability to take a metaphor everyone quotes and nobody can use, and give it a structure that generates falsifiable predictions. Schumpeter's "creative destruction" had circulated for half a century as a phrase for op-eds. Aghion and Howitt supplied the mechanism: the business-stealing effect, the entry-and-exit dynamics, the link running from one firm's innovation decision to a country's growth rate. Akcigit's word for what it did is "revolutionized," and his stated reason — that it enabled "back-and-forth between theory and firm-level data" — identifies the right thing. The genius, if the word applies, is in the joinery.

The counter-case deserves airing. This is collaborative work; the model is Aghion–Howitt, and the 2025 prize was shared not only with Howitt but with Joel Mokyr, an economic historian mining a different seam of the same question. Aghion did not discover that innovation drives growth — Schumpeter said it, and endogenous growth theory was an active field he entered rather than founded. And the framework carries a politics that critics find naive: the charge of techno-optimism and over-attachment to GDP is an objection to what the model treats as the goal, not a quibble about method. He built the best available instrument for measuring one thing; the argument is whether that thing is the right one to measure.

What the Theory Built

Aghion has been a fellow of the American Academy of Arts and Sciences since 2009, president of the European Economic Association in 2017, and editor of the Annual Review of Economics since 2018. He and Howitt shared the BBVA Foundation Frontiers of Knowledge Award in Economics in 2019, six years before Stockholm. France made him a Knight of the Legion of Honour in 2012 and an Officer of the Ordre national du Mérite in 2018. His books — Endogenous Growth Theory (1998), the two-volume Handbook of Economic Growth (2005), Competition and Growth (2006), The Economics of Growth (2009) and The Power of Creative Destruction (2021) — have become standard apparatus. The 1992 paper is now the thing graduate students are taught before they are taught to argue with it, which is the only durable form of victory in economics.