David Webb, activist investor who has earned about 20 percent a year from his personal investments in Hong Kong shares since 1995, explains why has advised readers of his widely followed website to avoid more than 75 of the city’s publicly traded companies -- several of which subsequently became targets of the largest-ever raid by the securities regulator. He speaks with Rishaad Salamat and Yvonne Man on "Bloomberg Markets: China Open." (Source: Bloomberg)