Potatoes Got Credit for a Population Boom — Potato History

Potatoes got credit for a population boom that lasted two hundred years. Proving it turned out to be far harder than saying it. This is the story of a crop that Andean farmers spent thousands of years building, a Swedish bishop who named three causes and couldn't separate them, and two economists who found a way to measure something most people thought could never be measured. The honest answer is not a number. It's a range — and the range is the interesting part. ━━━━━━━━━━━━━━━━━━━━ CHAPTERS 00:00 A jar on the Peruvian coast 01:36 It does not begin in Ireland 04:42 Europe: the legend of the guarded field 08:08 The bishop's three nouns 09:35 2011: a map and a date 11:38 Three things that number cannot tell you 14:33 The part that gets left out: Asia 16:33 Nobody knows who ━━━━━━━━━━━━━━━━━━━━ SOURCES Nunn, N. & Qian, N. (2011). "The Potato's Contribution to Population and Urbanization: Evidence From A Historical Experiment." Quarterly Journal of Economics 126(2): 593–650. — The source of the one-quarter figure, stated by the authors as their most conservative estimate. Villalobos, P. & Sevilla, J. (2022). "Potatoes: A Critical Review." Commissioned by the Forethought Foundation. — The independent replication that re-ran the code and narrowed the finding to between one sixth and one quarter. Earle, R. (2020). Feeding the People: The Politics of the Potato. Cambridge University Press. — The standard modern history, and the source for the finding that potatoes were already widely grown across Europe by the end of the 1500s. Valdez, L. M. & Bettcher, K. (2026). "Inka Freeze-Dried Potatoes from Tambo Viejo, Acarí Valley, Perú." Journal of Field Archaeology 51(5). — The chuño that opens and closes this video. Rumold, C. U. & Aldenderfer, M. S. (2016). "Late Archaic–Early Formative period microbotanical evidence for potato at Jiskairumoko in the Titicaca Basin of southern Peru." PNAS 113(48): 13672–13677. — The direct archaeological evidence for early potato cultivation. Hallberg, E. Havrefolket (doctoral thesis, 2013), and Wiking-Faria, P. Freden, friköpen och järnplogarna (doctoral thesis). — The two Swedish studies that argue Tegnér was wrong about all three of his causes. On the Frederick the Great legend: Jürgen Luh, historian at the Stiftung Preußische Schlösser und Gärten, has publicly documented that the guarded-field episode is not supported by the Prussian archives. The 66% land-requirement figure comes from Arthur Young's 1771 survey data, as cited in Nunn & Qian (2011). Production figures are FAO, 2022. The Tegnér remark is traditionally dated to 1833; no primary text has been located, and the video says so. If you find an error, put it in the comments — I'll check it, and if it holds up I'll pin the correction. ━━━━━━━━━━━━━━━━━━━━ #potato #foodhistory #history Secret Ingredient — the secret history behind everyday food. NEW EPISODE EVERY THURSDAY