NO.PZ2016010802000116
问题如下：
Convergence of incomes over time between emerging market countries and developed countries is most likely due to:
选项：
A. total factor productivity.
B. diminishing marginal productivity of capital.
C. the exhaustion of non-renewable resources.
解释：
B is correct.
Diminishing marginal productivity of capital means that as a country accumulates more capital per worker the incremental boost to output declines. Thus, all else the same, economies grow more slowly as they become more capital intensive. Given the relative scarcity and hence high marginal productivity of capital in developing countries, they tend to grow more rapidly than developed countries. This leads to convergence in income levels over time.
考点：经济趋同
解析：由于 marginal productivity of capital在发达国家表现的比较明显，而在发展中国家表现的比较不明显，所以在此前提下，相对于发达国家，发展中国家会经历一个高速的经济增长阶段，最终实现两类国家的经济发展趋同。所以只有B选项的说法是正确的。
解析第一句应该是在在发展中国家比较明显 是不是