Definition
The great-man theory is the historical framing — formalized by Thomas Carlyle in the 19th century, largely abandoned by professional historians since — that the shape of history is determined primarily by exceptional individuals: Caesar, Napoleon, Lincoln, Steve Jobs.
Rosling's quarrel is not with the existence of remarkable people but with the explanatory claim that they cause large-scale change. Most major shifts — demographic transition, public-health gains, the spread of education — are driven by population-level forces and slow institutional shifts that no single person could have produced or prevented.
Why it matters
How it works
The theory works on narrative grain. Biographies have protagonists; statistical trends do not. Schools, films, and political rhetoric all reward a story with a named hero at the center. So when a country industrializes, a disease retreats, or a market is created, the explanation that survives the editorial filter is the one that names a person rather than the one that names a fifty-year trend in institutions, capital, and population health.
Rosling's case studies repeatedly show the same pattern. The dramatic fall in child mortality across the world over the last sixty years has no founder — it is the product of vaccines, water infrastructure, education of women, and basic primary care, each pushed forward by thousands of unnamed practitioners and administrators. To credit a single leader for the change is to obscure the actual mechanism and to undervalue the institutions that did the work.
The corrective is the same counterfactual test as for scapegoating, applied in the positive direction. Imagine the named figure had been replaced by a competent ordinary contemporary. Would the outcome have changed substantially? For most large-scale gains the answer is "barely" — the trend was already in motion, the institutions already maturing. The named hero is a useful icon, but the explanatory work belongs to the system.