A historian who, in trying to explain why dynasties collapse, ended up inventing the discipline that studies why societies work at all.
Ibn Khaldun (1332-1406) was a jurist, diplomat, and historian born in Tunis who served, and was repeatedly imprisoned or exiled by, a succession of North African and Andalusian courts before retreating to a castle in Algeria to write his life’s central work. That work, the Muqaddimah (“Introduction,” 1377), was meant as a methodological preface to a universal history, but it outgrew that role entirely: the sociologist Ibn Khaldun is now more widely read than the historian he set out to be. His central analytical tool was asabiyyah, group solidarity, which he used to explain the rise and fall of dynasties as a structural cycle rather than a sequence of accidents or individual virtue and vice. That concept has its own dedicated entry; this one focuses on what Ibn Khaldun did with it, and around it, as a working economist and social theorist.
Ibn Khaldun’s economic thinking is the more specifically citable part of his legacy. In the Muqaddimah he described how a growing city’s population, organized around specialized crafts and trades, produces more total output than the sum of what those same people could produce working in isolation, an argument anticipating what Adam Smith would formalize as division of labor roughly four hundred years later. He extended this into an explicit theory of taxation and state revenue: at the start of a dynasty, he argued, light tax assessments yield large revenues because commercial activity is vigorous, while late in a dynasty’s life, heavier assessments yield smaller revenues because taxation itself has suppressed the activity being taxed. Arthur Laffer, credited with the modern “Laffer Curve” describing the same relationship between tax rates and total revenue, explicitly pointed to this passage as his own precedent, and Ronald Reagan cited Ibn Khaldun by name in defending the 1981 tax cuts built on that curve.
None of this makes Ibn Khaldun a supply-side economist in the modern partisan sense; he was describing a historical pattern he had observed across Arab, Berber, and Persian dynasties, not proposing a policy platform. What makes the Muqaddimah genuinely foundational is methodological: Ibn Khaldun insisted that history be explained through natural, structural, and economic causes rather than by narrating kings and battles or by moralizing after the fact, a standard historians like Arnold Toynbee later called the first attempt at a true philosophy of history and sociologists have credited as sociology’s actual origin point, well before the term or the discipline existed in Europe.
Source: Ibn Khaldun, The Muqaddimah: An Introduction to History, trans. Franz Rosenthal (1958); Bartlett, Bruce, “How Excessive Government Killed Ancient Egypt,” Equitable Growth (2015 reprint history of the Laffer Curve); Cato Institute, “The Muslim Thinker Who Inspired Reagan.”