() used to describe the situation when a change in one thing, such as the price of a product or service, or a change in people's incomes, results in only a small change in another thing, such as the amount that people want to buy无弹性的；无伸缩性的◆Demand for their product is inelastic.对他们的产品的需求无弹性。◆Some products such as petrol/gas are price inelastic —even when prices go up demand doesn't fall.一些产品，如汽油、天然气，其价格是无弹性的 ── 即使价格上升，需求也不会下降。OPPelastic ➡ picture at elasticity of demand