I'm in my early 20's, and working for my masters degree in a technical field. However, recently I have fallen in love with project management/leadership for nonprofits - and am considering a second degree in business (my BA+MA will be done in four semesters total - yes, I'm quick).
What would you consider to be the most useful areas to study, in terms of becoming effective as a manager? HR? Marketing? Sales? Or would you advise against obtaining a second degree?
[i](Please note that there is no extra cost for the extra BA except the time, since university is free of charge in my home country. This means that a double degree is much more attractive than in the US - especially since I am way ahead of my age group in my studies.)[/i]