Tokyo — North Korea continues to stiff Sweden over a bill for 1,000 Volvo sedans shipped back in the 1970s; a Chinese mining company called its four-year venture in the isolated nation a "nightmare"; and an Egyptian telecoms giant doing business there cannot repatriate its profits. All of which explains why North Korea has a well-deserved reputation as a corporate graveyard for foreign investors. And that raises an interesting question as Donald Trump and Kim Jong-un prepare for a high-stakes summit on June 12 in Singapore. Trump is dangling economic aid and investments if Kim agrees to give up his nuclear weapons. Yet if North Korea were to ever open up economically, would any CEO in his or her right mind be willing to put big money into a centrally planned economic under-achiever, known best for food shortages, a backward manufacturing sector and woefully inadequate infrastructure? Optimists like Singapore-based investor Jim Rogers see the mother of all turnaround plays, largely b...

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