The twinning rate has increased dramatically over the last four decades in developed countries. Two main factors drive this increase: delayed childbearing, as older women tend to have twins more frequently, and the expansion of assisted reproductive technology (ART), which carries an increased...

Inequality in the distribution of adult length of life - defined as age at death in the population aged 15 and over - is studied for virtually all countries of the world using a new database with over 9000 life tables covering a period of up to two centuries. The data reveal huge variation among...

We study the number of hours children in Africa and Asia are involved in paid child labor on the basis of a newly developed database with information on 169 000 children living in 16 countries. The proportion of involved children varies between 1 and 8 per cent, with generally lower figures in...

This paper presents the International Wealth Index (IWI), the first comparable asset based index of household’s material well-being, or economic status, that can be used for all low and middle income countries. IWI is similar to the widely used wealth indices included in the Demographic and...

The relationship between career migration and earnings is studied for married men and women in the Netherlands. The hourly wages of married men and women who made a recent long-distance move are found to be higher than those of married men and women who did not move or who moved only over a...

Long-distance migration of couples requires joint decision-making within the household. The uneven power balance between men and women and traditional gender roles have given rise to the concepts of 'tied stayer' (usually the male partner) and 'tied mover' (usually the female). Since these...