Cognitive Mobility: Labor Market Responses to Supply Shocks in the Space of Ideas
研究了苏联解体后苏联数学家涌入美国，导致美国数学家从这些领域撤离的现象，发现知识生产者因特定研究领域收益递减而转移研究方向，而非受益于人力资本溢出。
Knowledge producers conducting research on a particular set of questions may respond to supply and demand shocks by shifting resources to a different set of questions. Cognitive mobility measures the transition from one location to another in idea space. We examine the cognitive mobility flows unleashed by the influx of Soviet mathematicians into the United States after the collapse of the Soviet Union. The data reveal that American mathematicians moved away from fields that received large numbers of Soviet émigrés. Diminishing returns in specific research areas, rather than beneficial human capital spillovers, dominated the cognitive mobility decisions of knowledge producers.