This paper continues on the examination of measures of volume in the Kinai area (see volume 75, no. 6) and traces the establishment of de facto measure standards in western Japan during the medieval period. The understanding of the measurement of volume is essential in assessing agricultural yield potential, land system, and trading conditions, and yet its importance is not fully appreciated. By studying de facto measure standards, we are able to better comprehend the process of unification of the national economy. In the 15th century, in the western part of western Japan a measure called sanukito was the standard, while in the eastern part urimasu was used in the trade, in parallel with kinaihonto (the Kinai standard). Kinaihonto was almost the same in volume as sanukito, and thus there was potentially a de facto measure standard in western Japan and the Kinai area. In the 16th century, the use of urimasu spread and became standard in its surrounding areas. But by the end of the century, kinaihonto and sanukito revived to the point that either of these two measures was used universally throughout the whole of western Japan and the Kinai. It was the unification of the national economy, brought about by political unification, that determined the standardization of measures.
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