问题如下：
The production function is shown as follows:
Potential output growth = 1.25 + 0.68 × Growth of labor + 0.32 × Growth of capital
The coefficient on the growth rate of capital (0.32) refers to:
选项：
A.the marginal productivity of capital.
B.the growth rate of total factor productivity.
C.the relative shares of capital in national income.
解释：
C is correct.
In the neoclassical or Solow growth model, the coefficient on each factor’s growth rate is its share of income.
考点：α的定义
解析：本题直接考察α的定义，它代表资本对于总收入（总产出）中的贡献占比。
为什么不能理解成边际呢？增加一单位的资本，总产出也会相应增加 这么理解为什么不行呢？
