Practices such as early marriage, which correlates with an early start to childbearing, can be widespread. As ever-larger numbers of younger people begin streaming into the labour market, they are increasingly finding that the economy has not been robust enough to generate jobs for everyone. The reasons include disruptions in family planning programmes, and the aftermath of conflict and economic crisis. Most of these countries fall at a mid-level in terms of income, although a few are poorer, and a small number are wealthy.