Options traders are ramping up bets against the Hong Kong dollar as the city’s political unrest grows more violent and a slide in the Chinese yuan shifts attention to one of the world’s longest-standing dollar pegs. The ultra-stable currency so far isn’t budging. It has held the peg versus the greenback since 1983, and since 2005 has moved in the tight HK$7.75-to-HK$7.85 per U.S. dollar range. That hasn’t stopped speculators from loading up on options that would pay off if the city’s dollar weakens beyond that range. The value of put options that pay off if the currency weakens to HK$7.90 has been surging versus bets ... (full story)