假设一家椅子制造商，在短期内设备是不变的。该制造商观察到生产过程中的劳动投入与生产出的椅子

(1)计算该生产函数下劳动的平均产量和边际产量;

(2)该生产函数是否显示了劳动的边际报酬递减，请解释;

(3)请直观地解释劳动边际产量为负的原因？

Suppose a chair manufacturer is producing in the short run (with its existing plant and equipment). The manufacturer has observed the fallowing levels of production corresponding to different numbers of workers:

a. Calculable the marginal and average product of labor for this production function.

b. Does this production function exhibit diminishing returns to labor？ Explain.

e. Explain intuitively what might cause the marginal product of labor to become negative,