“700 Reasons for Studying Languages” is a report from the UK Subject Centre for Languages resulting from a research project which was carried out between 2003-2004. The research was to support the UK campaign to encourage more people to learn languages in an out of school.
You will find many results in the report that are valid for contexts outside of the U.K.
Angela Gallagher-Brett (2005). Seven Hundred Reasons to Study Languages. LLAS Centre for Languages, Linguistics and Area Studies, Southampton, UK.
Centre for Languages Website: https://www.llas.ac.uk/700reasons/orderform.html