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【简答题】
已知某一时期内某商品的需求函数为Q d =50-5P，供给函数为Q s =-10+5P。假定供给函数不变，由于消费者收入水平提高，使需求函数变为Q d =60-5P。求出相应的均衡价格P ε 和均衡产量Q ε 。
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