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Great Divergence

Morgan Kelly

Irish economist and economic historian, professor at University College Dublin. Working largely with Joel Mokyr and Cormac Ó Gráda, Kelly is the lead quantitative voice in the recent labour-quality reinterpretation of British industrialization and one of the most influential critics of econometric over-reach in economic history.

Intellectual program

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The substantive line runs through two papers with Mokyr and Ó Gráda. Precocious Albion: A New Interpretation of the British Industrial Revolution (Annual Review of Economics, 2014) argues that what distinguished Britain was not Allen’s high wages relative to cheap capital and energy but the superior quality of British labour: better-nourished, more numerate and mechanically literate workers, formed through a deep and accessible apprenticeship system. On this reading the high-wage region of early-modern England is partly an artefact of high productivity — efficiency wages for an unusually capable workforce — which reverses the causal arrow in Allen’s induced-innovation thesis. “The Mechanics of the Industrial Revolution” (2023) develops the case more formally, emphasizing the abundance of skilled mechanics and artisans able to build, calibrate, and maintain the new machinery — the practical-competence channel that complements Mokyr’s “useful knowledge” account. The position aligns Kelly with the upper-tail human-capital and bricolage line and with Jane Humphries on apprenticeship as the engine of British skill formation.

Kelly’s second, methodological, contribution has been corrosive to a whole genre of historical-persistence econometrics. “The Standard Errors of Persistence” and related work show that many celebrated regressions linking some deep historical variable to modern outcomes survive placebo tests poorly: spatial autocorrelation inflates significance, so that randomly generated “explanatory” variables often fit as well as the real ones. The critique is not aimed at the IR labour-quality story specifically but at the credibility of long-run cross-country and cross-region “history-causes-the-present” claims generally, and it has forced the field toward spatial-statistics robustness checks.

Reception and contestation

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The Precocious Albion / labour-quality position is one of the principal live alternatives to Allen’s high-wage account, and the Kelly–Mokyr–Ó Gráda partnership is among the most cited recent interventions in the IR-causation debate. Allen and others contest the labour-quality reading — the evidence on relative skill and the interpretation of the wage premium are exactly what is disputed — and the broader real-wage foundation has been further unsettled by the data-reconstruction work of Judy Stephenson and Humphries. Kelly’s persistence critique is widely respected and has been influential well beyond the IR literature.

Associated positions

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Key works

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  • With Joel Mokyr and Cormac Ó Gráda: “Precocious Albion: A New Interpretation of the British Industrial Revolution” (Annual Review of Economics, 2014).
  • With Joel Mokyr and Cormac Ó Gráda: “The Mechanics of the Industrial Revolution” (Journal of Political Economy, 2023).
  • “The Standard Errors of Persistence” (Journal of Historical Political Economy, 2019) — methodological critique of cross-country growth-and-history regressions.