if we assume that population & resources grow linearly with the area of a country Why would you assume that? Africa's population density is not exceptional in

if we assume that population & resources grow linearly with the area of a country Why would you assume that? Africa's population density is not exceptional in any way But Earth's population density is off the chart compared to other planets. Africa is too big to generalize. The USA has both New York City and Wyoming. Population and economic value are intensely concentrated in cities, so being big or small doesn't matter. Having productive cities does.