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文献来源 trans-regional investment To determine the number of subsidiaries the parent firm has invested in cities outside of its headquarters, we take the logarithm of the total number of subsidiaries and plus 1 to measure firms’ trans-regional investment (invest). Qu, X., Xia, J. (2024). Environmental regulation and firms' trans-regional investment: Evidence from the implementation of the New Environmental Protection Law. Finance Research Letters. 数据来源 清洗数据 cd C : \ Download
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