Population size is static or declining in developed nations, where birth rates tend to be low and the number of elderly is increasing rapidly. Developing nations, where birth rates are higher, will account for most of the increase in population from 2010 to 2050. In several European countries, the native population is actually decreasing, and the overall population would have shown a marked decline from 2008 to 2012 had it not been for immigrants from less developed nations. 163 What are the implications of this trend? Explain.