萨缪尔森的19th Ed.上有这样一句话：In long-run equilibrium, the real interest rate settles at that level where the quantity of capital that firms desire to hold just matches the value of wealth that people want to own.
请问，这句话中的后半句拿quantity和value比较了，怎么比啊？我看不懂这句话，谁能用经济学的知识解释一下（不要简单的翻译），谢谢！顺便再问个问题:书上有这么一句话,Would investment gradually decline to zero as all
investment opportunities are exhausted? 请问,在平衡点处显然资本的量不为0啊,平且平衡了,为何此处还要再问是否有一天投资为0呢?这就好比市场的馒头的价钱会稳定在某一点,可在那一点上永远有人卖馒头,不可能有一天没人卖啊.