The Elite Brain Drain
收集顶尖科学家的流动与生产力数据，发现近半高被引物理学家在国外工作，且向高研发支出国家迁移；移民与留守者h指数相同，但英美移民获诺贝尔奖比例下降。
We collect data on the movement and productivity of elite scientists. Their mobility is remarkable: nearly half of the world's most-cited physicists work outside their country of birth. We show they migrate systematically towards nations with large R&D spending. Our study cannot adjudicate on whether migration improves scientists' productivity, but we find that movers and stayers have identical h-index citations scores. Immigrants in the UK and US now win Nobel Prizes proportionately less often than earlier. US residents' h-indexes are relatively high. We describe a framework where a key role is played by low mobility costs in the modern world.