Productivity Change under an Individual Transferable Quota Management System
研究了1990年实施个人可转让配额（ITQ）管理的中大西洋蛤蜊和圆蛤渔业的生产率变化，发现ITQ系统未能持续提升渔船生产率，原因与生物量空间变化和无法进入高产渔场有关。
This study examines productivity change in the Mid‐Atlantic surfclam and ocean quahog fishery, which has been managed since 1990 using Individual Transferable Quotas (ITQ). Productivity change is estimated through a Malmquist index from 1981–2008, capturing change before and after implementation of the quota system. We then decompose the index to examine changes in technical efficiency, scale efficiency, and technical change. Our findings indicate that the ITQ system has not sustained gains in vessel productivity. These results are thought to be driven by spatial changes in biomass and the inability to access more productive fishing grounds.