neo classical model老师上课讲Level of the output 能因为capital增加而提升， 但是growth rate只能科技进步提升。
mock题里面per-capita-growth level到底是指的是level of output还是grwoth rate呢？？因为既有关检词level，又包含growth。答案是A。
Next, Mahlangu considers Country B. Country B is operating at its steady-state rate of growth where the marginal product of capital is equal to its marginal cost. Mahlangu expects that Country B will be able to permanently increase its per capita growth level.
Based on the neoclassical model, which of the following would best support Mahlangu's expectation for Country B?
A：An improved level of technology
B：An increase in business investment
C：An elimination of restrictions on the inflow of foreign investment
