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FinanceProfessor.com:  Food for Grooming - Freakonomics Blog - NYTimes.com

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Monkeys use Currency for food: http://freakonomics.blogs.nytimes.com/2009/11/03/food-for-grooming/ 17 days ago

[freakonomics] Food for Grooming: Among these monkeys, grooming is a hot commodity and is viewed by scientists .. http://bit.ly/2oRhhq 11/3/2009

Food for Grooming: Among these monkeys, grooming is a hot commodity and is viewed by scientists as a form of "p.. http://bit.ly/2oRhhq 11/3/2009

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Food for Grooming - Freakonomics Blog - NYTimes.com
FinanceProfessor.com — Food for Grooming - Freakonomics Blog - NYTimes.com : "New research indicates that in addition to exchanging goods and services, monkeys adjust exchange rates as supply changes. Ronald Noe, a primate ethnologist, measured the grooming behavior of vervet monkeys in southern and eastern Africa. Among these monkeys, grooming is a hot commodity and is viewed by scientists as a form of “payment” for services. Noe found that when the number of food providers increased, each individual food provider received less grooming."