IDENTIFYING OPTIMAL SECTOR GROUPINGS WITH THE HYPOTHETICAL EXTRACTION METHOD*
研究了如何用假设提取法找出经济中的关键行业和关键行业组，推导出行业因子价值的解析解，并应用于澳大利亚经济的水资源使用、二氧化碳排放和利润工资生成分析。
ABSTRACT We formulate the problems of finding a key sector and a key group of sectors in the economy by the hypothetical extraction method (HEM), and derive their analytic solutions that are termed industries’ factor worths. It is shown that the key group of k ≥ 2 sectors is, in general, different from the set of top k industries selected on the basis of the key sector problem, the issue which is totally ignored in the input–output (IO) linkage literature. Further, the related problems of finding a key region and a key group of regions in an interregional IO setting are discussed. We also examine how a change in an input coefficient affects the factor worth of an industry. The key group problem is applied to the Australian economy for factors of water use, CO2 emissions, and generation of profits and wages.