The assessment of the productivity change of water utilities provides essential information to sector managers and regulators. This study uses the Luenberger-Hicks-Moorsteen Productivity Indicator (LHMPI) to evaluate productivity change as it can be further decomposed into three components namely technical change (TC), technical efficiency change (TEC), and scale efficiency change (SEC). This study evaluates the productivity of several water companies in England and Wales from 2001 to 2018. We found that productivity declined 1.2% per year due to the use of inputs that increased by 1.4% per year relative to outputs that increased by 0.2% per year.

对水务公司生产力变化的评估为部门经理和监管者提供了重要信息。这项研究使用Luenberger-Hicks-Moorsteen生产率指标（LHMPI）来评估生产率变化，因为它可以进一步分解为三个组成部分，即技术变化（TC），技术效率变化（TEC）和规模效率变化（SEC）。这项研究评估了2001年至2018年英格兰和威尔士几家自来水公司的生产率。我们发现，由于使用的投入每年增长1.4％，而使用的产出每年增长0.2％，因此生产率每年下降1.2％ 。