Ok, so I guess you really are unaware :
http://www.worldbank.org/depweb/beyond/beyondco/beg_03.pdf
Some quotes :
Pg 17 :
"Today’s low-income countries still have
the world’s highest birth rates (see Map
3.1), although women tend to have fewer
children than before. "
Page 18/20 : "
In the short run, rapid population growth in poor countries leads to lowerGNP per capita, allowing fewer resources to be invested in each person’s human capital—the key to increasing labor productivity. But in the long run, provided that labor productivity does in
fact increase, having more workers could contribute to the economic strength of
developing countries."
So I should point out something here - they have several charts depicting the first part of their statement about population growth leading to lower GNP per capita. The second part of their statement is conjecture, ie "could contribute to...".
There is a map of population growth on page 18, figure 3.1 Let us all know when you're moving to one of the booming high population growth countries that are going to be pulling in the dough in the future, and how that works out for ya.
More evidence :
http://www.ncbi.nlm.nih.gov/pubmed/12266665
"The relationship between population increase, economic growth, education and income inequality was examined in a cross-section study based on data from 26 developing and 2 developed countries. As other studies have noted, high population growth is associated with a less equal income distribution.
A 1 percentage point reduction in the rate of population growth tends to raise the income share of the poorest 80% in the less developed world by almost 5 percentage points and is associated with a 1.7 percentage point increase in the income share of the poorest 40%.
The relationship between short-run income growth and equality, on the other hand, is strong and positive. Estimates suggest that a 1 percentage point increase in the short-run rate of growth of the gross domestic product (GDP) increases the income share of the bottom 80% by about 2 percentage points and that of the poorest 40% by almost 1 percentage point. Although higher mean schooling appears to be a mild equalizer, educational inequality does not appear to have an adverse effect on income distribution. Overall, these results challenge the widely held belief that there must be a growth-equity trade-off. Moreover, they suggest that the impact of educational inequality on income distribution may be different from that observed in earlier studies, implying a need for caution in using these earlier results as a basis for educational policy development."