Profitability, Capacity and Productivity Trends in an Evolving Rights Based Fishery: The Norwegian Purse Seine Fishery
研究挪威围网渔业从开放准入转向基于权利的管理系统后，通过指数分解方法分析1994-2013年船舶收入和成本变化，发现产出价格是收入增长主因，而资本投资未伴随捕捞量增加导致早期生产率下降。
Regulators in many countries have adopted individual quotas as a means of dealing with the open access problem inherent in fisheries. The Norwegian Purse Seine fishery has evolved over the last 40 years from an open access fishery to a Rights Based management system with individual vessel catch quotas assigned to all major fish species. Regulations do allow for merging vessel quota. The purpose of this paper is to employ an index approach to decompose vessel revenues and costs by factor components. The index approach can measure the importance of prices, output and regulatory changes impacting productivity and provides insight into changes in a mature IVQ fishery. The current study uses a large individual vessel data set for the period 1994–2013. Results show that over time output prices have been the main drivers associated with increased revenues. We correlate output prices with an evolving IVQ fishery, and changes in harvest and demand conditions. Ongoing capital investment, not offset by increased harvest, has seen productivity decline in the early periods of the study but some recovery towards the end of the period.