Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago, Chile.
Centro de Desarrollo Urbano Sustentable CONICYT/FONDAP/15110020, Santiago, Chile.
Environ Sci Pollut Res Int. 2020 Apr;27(12):13155-13165. doi: 10.1007/s11356-020-07918-x. Epub 2020 Feb 3.
In monopoly services that provide drinking water, it is of paramount importance to evaluate the total factor productivity (TFP) change of water companies. Most of the previous studies have computed the Malmquist productivity index (MPI) by applying non-parametric methods. By contrast, following a pioneering approach, in this study, we estimated the MPI using a parametric method that allows us to decompose TFP change into a larger number of drivers, including exogenous and quality of service variables. An empirical application for the Chilean water industry over 2007-2015 was conducted. We found that productivity change estimates were variable across years, differentiating a first period (2007/11) in which productivity declined and a second period (2011/15) in which TFP notably improved. In both periods, scale efficiency change and input mixed effect were the main drivers of productivity change, illustrating the importance of operation scale in water companies' performance. The decomposition of the TFP change in a large number of drivers is essential to propose incentives and measures to promote productivity across time.
在提供饮用水的垄断服务中，评估水务公司的全要素生产率（TFP）变化至关重要。 之前的大多数研究都通过应用非参数方法计算了 Malmquist 生产率指数（MPI）。相比之下，本研究采用了一种开创性的方法，使用参数方法估计 MPI，该方法允许我们将 TFP 变化分解为更多的驱动因素，包括外生和服务质量变量。对智利水行业 2007-2015 年进行了实证应用。我们发现，生产率变化的估计值在不同年份有所不同，区分了生产率下降的第一个时期（2007/11）和 TFP 显著提高的第二个时期（2011/15）。在这两个时期，规模效率变化和投入混合效应都是生产率变化的主要驱动因素，说明了运营规模在水务公司绩效中的重要性。将 TFP 变化分解为大量驱动因素对于随着时间的推移提出激励和措施以提高生产率至关重要。
