The article explores how population growth in African countries affects investment over time. By analyzing data from 1977 to 2007, the researchers found that population growth can have different impacts on investment in different countries. For example, in Ivory Coast, population growth decreases foreign and public investments, while in Swaziland, it increases public and private investments. The study suggests that population growth may not always lead to more investment, and countries should consider implementing measures like family planning and birth control policies to manage the effects of population growth on investment.