Subway, Collaborative Matching, and Innovation
利用北京地铁2000-2018年的快速扩张，研究发现两地间通勤时间每减少一小时，合作专利数量增加14.85%至37.69%，且对高产创新者的匹配影响最大。
Abstract Using rapid expansion of the Beijing subway from 2000 to 2018, we analyze its impact on collaborative matches in innovations. We find that an hour reduction in travel time between a pair of locations in Beijing brought 14.85% to 37.69% increase in collaborated patents. Far-apart location pairs were more affected, and the local average causal response is approximately 34.92% to 82.29%. The effect is mainly driven by increased matches among highly productive innovators. The entry of new innovators, relocation of existing innovators, and collaborations among low-productive innovators also contribute to the increase in collaborative matches, especially in the long run.