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M21 applies an instrumental variable to mitigate omitted variable bias, such as regional incentives influencing both cluster size and patent activity. The instrument relies on counts of inventors in the same discipline employed by companies in different cities. A programming mistake—failure to sort data by city—results in an improperly constructed instrument. After rectifying the code, the findings become insignificant.，详情可参考WhatsApp網頁版
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我对这样的开头就会印象深刻。《穆斯林的葬礼》开头的场景，大部分人也不会这么写，我检索的是序曲中一段关于槐树的描写，霍达用了“老干龙钟”，我用那个词找到这个结果。所以是我对《穆斯林的葬礼》开头部分印象深刻，锁定了这部作品，由“老干龙钟”这样的词，定位到杨本芬的作品与它的相似性。