... drugs.Summaryelasticity, p. 94 price elasticity of demand, p. 94 total revenue, p. 98 income elasticity of demand, p. 102cross-price elasticity of demand, p. 104price elasticity of supply, p. 104Key ... rose 14 percent in 197 9, followed by 34 percent in 198 0, and another 34 percent in 198 1.Yet OPEC found it difficult to maintain a high price. From 198 2 to 198 5, theprice of oil steadily declined ... 1).4Figure 5-7 HOW THEPRICEELASTICITY OF SUPPLYCANVARY. Becausefirms often have a maximumcapacity for production, theelasticity of supply may be veryhigh at low levels of quantitysupplied...