According to a person involved in the event, Rick Cassidy, President of TSMC's US division, stated in an online seminar on October 23 that the yield rate of chips produced at TSMC's Arizona factory is about 4 percentage points higher than that of similar factories in Taiwan. A spokesperson for TSMC declined to directly comment on Cassidy's activities, but mentioned President Wei Zhe Jia's statement during an investor conference call last week that TSMC's US factories have "very good yield rates". (Bloomberg)