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The Ding Hai Effect is the observation that whenever the Hong Kong actor Adam Cheng stars in a new television show, there is a sudden and unexplained drop in the market. Initially, the Ding Hai effect occurred whenever the TVB drama series Greed of Man or its remake, Divine Retribution. Later, it was also observed that the effect occurs whenever a new drama show that Cheng stars in was aired. This phenomenon created a career trough for Adam Cheng in Hong Kong during the 1990s, for the two over-the-air television stations in Hong Kong avoided using Cheng for its dramas, partly (if not completely) because they did not want to bear responsibility for a stock market crash.