Ryō

adolah pitih ameh unit dari sistem shakkanhō pado pra-Meiji Jopang. Iko go akhianyo baganti jo sistem mato uang  babasis yen Jopang.

Asa
Ryō mulonyo marupoan satuan barek dari Cino, iyolah tael. Ko go mulai digunoan di Jopang salamo pariode Kamakura. Pado pariode Azuchi–Momoyama, bareknyo nyaris saragam di saluruah Jopang, sakitar 4,4 monme sabagai satuan barek (hampia samo jo 16,5 gram).

Salamo periode Sengoku, babagai daimyō lokal mulai mancetak pitih inyo surang. Ciek dari koin pribadi nan paliang takana dan paliang bagengsi iyolah koshukin nan dikaluakan dek panglimo parang Takeda Shingen, nan punyo simpanan ameh nan gadang di dalam wilayahnyo. Nilai koshukin badasarkan pado bareknyo, dek ciek koshukin samo jo ciek ryō ameh, dan kudian diagiah cap jo bareknyo (sakitar 15 gram). Salamo periode Tenshō (1573–1592), ciek ryō samo jo ampek koku bareh, atau 1.000 koin kuningan.

Rujuakan
 Lucassen, Jan. Wages and Currency: Global Comparisons from Antiquity to the Twentieth Century. Peter Lang (2007), 
 Ohnuki, Mari, "The Genroku, Hoei, Shotoku, Kyoho, and Gembun Koban", Short Essays on Monetary History Contained in Monetary and Economic Studies, Research Division 3, Institute for Monetary and Economic Studies, Bank of Japan (ed.), Monetary and Economic Studies, 15.2 (1997).
 Honjo, Eijiro, "The Economic thought in Tokugawa days", Kyoto University Economic Review, vol. xiii, no. 1 (Kyoto, Oct. 1938), p. 1–22. [Overview of the period 1600 to 1867]