The petroleum sector is a service-intensive industry. The quality, price and availability of services are therefore important for the productivity level in the petroleum sector. This paper analyses how intermediate inputs contribute to productivity in the Norwegian petroleum sector and discusses how technical progress and changes in the international trade regime affect productivity and vertical relations between oil companies and their suppliers. It is shown that in a small market, tailor-made inputs and close vertical relations between the oil companies and their suppliers are the preferred and most cost-effective technology. As the market expands, the relative cost of tailor-made inputs increases, and at one critical point becomes less cost-effective than standardised inputs. A policy implication of the analysis is that the NORSOK policy of enhancing standardisation needs to be complemented with a more open market in order to achieve its objectives. The analysis is particularly relevant for oil-related producer-services, since this is the market for intermediate inputs that is the least open.
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