The handlers either gave both monkeys an identical reward (a slice of cucumber) or gave just one of the monkeys the much preferred reward of a grape for completing exactly the same task.

BBC: Puppet experiment suggests humans are born to be fair

Three such cards have rates of nearly 30% for borrowers who fall behind on their payments, including the Marathon Platinum reward card and the Speedway SuperAmerica Platinum MasterCard, both issued by JPMorgan Chase, and the Citgo Preferred Visa, issued by Citigroup.

FORBES: Card Sharks