Problem 8: M21 alters the data's time unit, from one-month to three-year intervals. According to M21, this addresses missing observations; when inventors do not patent, they lack data entries. M21 contends this induces a downward bias at shorter intervals due to increased missing extensive margin effects.
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上周，迪士尼新任首席执行官乔希·达马罗刚刚履新，迪士尼与OpenAI的合作原本是前任CEO罗伯特·艾格留给他的重要"遗产"，但Sora的关停使得局面变得微妙。
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