The paper is based on an individual life-cycle model, which describes the purely economic components of human capital. The present value of human capital is determined by all future income flows, which at the same time constitute the individual as well as the total tax base of a nation....

A key way for the world's poor - nearly half of humanity - to escape poverty is to earn more for their labor. Most of the world's poor people are self-employed, but because there are few opportunities in most developing countries for them to earn enough to escape poverty, they are working hard...