Taipei, Taiwan – Like many Hong Kongers, accountant Edelweiss Lam spent the last week watching the city’s stock market wipe out 14 months of gains as the Hang Seng Index fell below the psychological threshold of 15,000 points. It was not the first time Lam, who has been investing on and off in Hong Kong stocks since the late 1990s, had seen it happen. The index dropped below...