Simplify the following text for a Grade 13 native English-speaking person.
Original: Globally , forced labor generates $ 31bn , half of it in the industrialised world , a tenth in transition countries , the International Labor Organization says in a report on forced labor ( `` A global alliance against forced labor '' , ILO , 11 May 2005 ) .
Simplified: Globally , forced labor generates $ 31bn , half of it in the industrialised world , a tenth in transition countries , the International Labor Organization says in a report on forced labor .