Aven, Eyvind; Lovas, Kjell; Osmundsen, Petter - In: International Journal of Global Energy Issues 26 (2006) 1/2, pp. 158-169
Portfolio theory indicates that risk management should take place at the group level. Hedging at the project level or in the individual business areas may lead to suboptimal results. However, the efficiency of a profit centre depends on its management's being able to influence factors that are...