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Население российского региона лишилось газоснабжения вследствие атак ВСУ08:40,更多细节参见飞书
To evaluate selection bias, M21 conducts an event study tracking inventors who relocate between cities. Since moving alters the cluster size, a noticeable impact on patenting should emerge; if inventors self-select into larger urban areas, a pre-move trend would be visible. I demonstrate that the initial event study employs a flawed model, failing to utilize relocation-induced variation. Implementing a correct mover event study yields no significant outcome.。https://telegram官网对此有专业解读
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