Why should you consider taking a course in demography in college?
为什么你应该考虑在大学里修一门人口学的课程呢？
其二是人口统计学。
Now demography and productivity are pushing in the same direction.
现在，人口统计学和生产率形成了合力。
But here again, demography plays a role.
但人口因素在这里也有重要影响。
Finally, demography is a distinct advantage.
最后，人口结构是一个明显的优势。
Second, and more subtly, one can look at demography.
第二，更加微妙的是，看看人口统计学方面。
Such an abrupt change is hard to explain by demography alone, however.
如此剧烈的变化是很难仅仅用人口统计学解释的。
For most of human history economic power has been determined by demography.
对于大部分人类历史来说，经济实力取决于人口。
But even if demography guarantees nothing, it can make growth harder or easier.
但是即使人口结构本身不能保证什么，它还是可以让经济增长变得更困难，或更轻松。
Demography is the main reason.
人口是其中的主要原因。
人口情况并非命运。
人口只是一个开始。
人口只是一个开始。
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