Although basing on the theory of elastic stability, these formulas agree well with test results in inelasticrange as well.
这些公式虽然由弹性稳定理论导出，和非弹性范围内的试验结果也吻合较好。
2
Linear demand curves, except for those that are perfectly vertical or horizontal, have points on them that range from elastic to inelastic and one piont that is unit elastic.