Problem:
I'm looking for a theory demonstrate that investing in human resource or seeking to develop employees skills valuable than investing in FDI or any kind of investment.
What I'm trying to find is theory related to human resources similar to the theory of the cost opportunity in which investing in particular business might be profitable but investing in employees skills for long-terms more profit.
I just need theory (more than one if possible) demonstrate the above mentioned, and academic references too (journal or article).
If the journal or article requires a fee, just provide me with the link and necessary information.