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.
要不是那些完全垂直或水平的线性需求曲线对点他们该范围从无弹性，弹性和是弹性的单位的一个点。
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.
要不是那些完全垂直或水平的线性需求曲线对点他们该范围从无弹性，弹性和是弹性的单位的一个点。
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