Principles of social cost-benefit analysis of public road projects followed in South Africa
CITATION: Pienaar, W. J. 2018. Principles of social cost-benefit analysis of public road projects followed in South Africa. South African Journal of Industrial Engineering, 29(4):129-140, doi:10.7166/29-4-1926.
The original publication is available at http://sajie.journals.ac.za
ENGLISH ABSTRACT: This article discusses the most pertinent principles that underlie the preferred social cost-benefit analysis methodology to evaluate public road projects in South Africa. The ‘cost’ component of the analysis is the once-off investment cost sacrificed to establish a facility, and the ‘benefit’ component is the recurring reduction of disutility emanating from the operation, maintenance, and use of a facility. To determine future road-user benefits, the article develops a social surplus criterion that is termed ‘socio-economic user surplus’. A procedure is provided of the way that social cost-benefit analysis should be supplemented by the application of equity weighting, with a view to indicating both the expected allocative efficiency and distributive efficiency of a proposed road project. Lastly, the article discusses why the economic impacts that may stem from economically justified road projects are not considered in a social cost-benefit analysis.