Are Price and Income Elasticities of Demand Constant? The UK Experience by JoyceDargay. Published in May1992 by the Oxford Institute of Energy Studies(OIES), 57 Woodstock Road, Oxford OX2 6FA, United Kingdom. Tel: 0865 311377.Fax: 0865 310527. Price: œ14.00, overseas œ16.00. 36 Pages.