Longest journeys can take 27 hours (Stats from Nov 20 Plan Int'l and World Education Assessment of Child Labour in Nepal) The majority of child labourers are trafficked internally.

BBC: Nepal: 'I was 14 when I was sold'

Child labourers in the Philippines, low-income black children in the US and low-caste girls in India all suffer very different educational problems which call for adapted solutions and policies.

UNESCO: WORLDWIDE

The reason to incur these costs is that the benefits that children, families and employers in Sialkot can expect once former child labourers finish school (ie, a more productive and higher paid adult workforce) far outweigh the short-term costs.

ECONOMIST: Letters

Bringing these children, who often belong to disadvantaged groups such as migrants, child labourers or children with special needs, into school and retaining them and providing trained teachers and relevant curricula, will be a major challenge, Mr Parsuramen said.

UNESCO: Education