Alan - Thanks for that link to the Capuchin monkey study. One side  
point: what they are engaged in is barter--the metal disks are not "fiat  
currency."  There are no liabilities! I like this passage:  
  
"Non-standard trades (including those in which tokens were thrown  
from the enclosure or those in which multiple tokens were pressed into  
an experimenter's hand), were not rewarded and the subject was allowed  
to make that choice again."  
  
Who knows, the monkeys might have thrown 1000 before they ever made a  
successful "exchange."  
  
Best,  
  
Mathew Forstater