THE 37-year-old man reached his hand into a box of goodies. His left hand received the money from his customers, who were all vying to buy his ice cream. ”Kina or rupiah?” the father of one asked his customers in early August. The rupiah, as we all know, is the Indonesian currency. But kina? It is the Papua New Guinean currency.

Suyono, born in East Java, has been selling ice cream for almost three years at the Indonesia-Papua New Guinea b