En modell för produktivitetsanalys av väginvesteringar

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The construction industry’s productivity performance, measured on an aggregate level, is dismal compared to other industries. Despite a substandard performance, no reasons have been established. One explanation is that disaggregate data facilitating a deeper analysis of the development has not been available. A huge share of the construction industry consists of infrastructure construction and maintenance. All infrastructure activities of this nature is competitively tendered. This provides the basis for the recommendation given in the present study for – first – how to measure productivity, or equivalently cost efficiency, and – second – to provide scope for analyzing any (positive, or more probably negative) performance trend. To be specific, the idea is to use the tendered contracts or possibly the documented outcome of each contract, or even both, to develop our understanding of the development of productivity. Within the scope of this proposal, focus is on Design-Bid-Build (DBB) contracts (utförandeentreprenader). One particular aspect of DBB contracts is that a construction assignment is based on a detailed Bill of Quantities (BoQ). This document describes in great detail precisely which activities an entrepreneur is supposed to implement and also the quantity of each. Having implemented the BoQ results in a piece of infrastructure without the contract necessarily has described the nature of the road or railway to be built. The recommended method for measuring productivity development is to use Stochastic Frontier Analysis (SFA). This approach has been developed over a long period of time and applied in a number of different sectors of the economy. It has, however, never been tested on infrastructure investment projects. The idea is to test SFA in full scale on a number of similar road investment projects and to use the BoQ’s and associated bid prices for measuring performance both on a cross section sample of projects and subsequently also over time.

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