Zeni were small copper coins used for commerce in Rokugan. Twenty zeni were equal to one silver bu, and a total of one-hundred zeni equalled one copper koku.  A Zeni usually bought a week's worth of rice. 
The sources relating to this article are in conflict with each other.
|"Roleplaying in the Emerald Empire" page 29 states a bu was ten zeni, so a koku was 50 zeni. --Oni no Pikachu 09:23, November 22, 2011 (UTC)|
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