Food for Grooming - Freakonomics Blog - NYTimes.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