需求曲线为Pd=30-0.2Q,而Ps=10+0.2Q的供应曲线。在18卢布的价格需求的价格弹性
由需求公式,0.2Q = 30 - Pd,Q = 150 - 5Pd
需求的价格弹性系数 ED = -Q' * Pd/Q = 5Pd/Q
Pd = 18 时,Q = 150 - 5 * 18 = 60
ED = 5 * 18/60 = 1.5 。
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由需求公式,0.2Q = 30 - Pd,Q = 150 - 5Pd
需求的价格弹性系数 ED = -Q' * Pd/Q = 5Pd/Q
Pd = 18 时,Q = 150 - 5 * 18 = 60
ED = 5 * 18/60 = 1.5 。