PAUL BROWN

 [From Gus] I made up this puzzle after visiting a Temple in Bali where numerous monkeys were stealing objects from the visitors: glasses, hats, flip-flops, cameras - anything they could get their hands on. The question I posed was: What motivates the monkeys to steal the visitors' possessions?

 Many years ago in that temple you visited in Bali a monkey took a pair of glasses from a tourist and was subsequently (and unwittingly) rewarded by a temple guide who lured the monkey with a tasty treat which was traded for the glasses.  Upon returning the glasses to the tourist, the temple guide was rewarded with a grateful tip from the tourist, and it was ‘monkey see, monkey do’ from that time forward.