Japan Ranked Its Nobility In Rice
For two and a half centuries, Japanese aristocrats were ranked by how much rice their land was assessed to produce. Not how much money. How much rice.
The unit was the koku, and a domain's assessed figure — its kokudaka — set its land tax, its obligations, its samurai stipends and its standing. The Maeda clan's Kaga domain was the largest, and it is still known as "Kaga of a Million Koku". Kanazawa throws an annual festival named after the phrase.
The interesting part is the word assessed. Kokudaka was not what the fields actually produced. It was what a survey said they produced, and the shogunate rarely resurveyed. So official figures drifted steadily below real output, and domains had every possible incentive to leave them there. An entire ruling class was ranked on a number everyone knew was stale and nobody wanted corrected.
That is a surprisingly modern problem to find in a feudal tax system.
What we are deliberately not giving you: the standard conversions. You will see koku confidently defined as about 180 litres, or 150 kilograms, or exactly the rice one adult eats in a year. Those figures are consistent across reference sources and we could not confirm any of them in a peer-reviewed or university-press text. They are rules of thumb that hardened into facts through repetition, which is a thing that happens constantly in food history and is most of the reason this library exists.
Sources
- Ministry of Land, Infrastructure, Transport and Tourism (Japan), heritage database entry on the Maeda family and the hyakumangoku ("million koku") tradition.
- Roberts LS. Performing the Great Peace: Political Space and Open Secrets in Tokugawa Japan. University of Hawai'i Press, 2012 — on assessed versus actual yield and the absence of resurveys.