A tale of two cities: Communication, innovation, and divergence
构建了一个两地区内生增长模型，发现数字通信降低了距离成本，促进了专业化分工，提高了整体增长率，但加剧了地区内和地区间的不平等，与美国城市间创新活动集中、收入不平等和技能分化趋势一致。
Abstract We present a two‐area endogenous growth model where abstract knowledge flows at no cost across space but tacit knowledge arises from the interaction among researchers and is hampered by distance. Digital communication reduces this “cost of distance” and reinforces productive specialization, leading to an increase in the system‐wide growth rate but at the cost of more inequality within and across areas. These results are consistent with evidences on the rise in the concentration of innovative activities, income inequality, and skills and income divergence across US urban areas.