问答题 如果资本和劳动力增加10/%引起的产出增加少于10/%，可以说生产函数表现出规模效益递减的性质。如果资本和劳动力增加10/%引起的产出增加多于10/%，可以说生产函数表现出规模效益递增的性质。为什么生产函数表现出规模效益递减或递增呢?
   If a 10 percent increase in both capital and labor causes output to increase by less than 10 percent, the production function is said to exhibit decreasing returns to scale. If it causes output to increase by more than 10 percent, the production function is said to exhibit increasing returns to scale. Why might a production function exhibit decreasing or increasing returns to scale?