No, Auftraggeber einer wissenschaftlichen Studie is the person who initiates a study/survey and usually pays for it. This always raises the question of the scientific independence of those who conduct it. Maybe the only goal of this study was to find evidence for the inverse-proportional interrelation between sexual appetite and economic problems while counter-evidence was deliberately neglected. (Not incidentally [or to put it sarcasticly: passenderweise], the commissioner of the study/survey is the head of a clinic treating fertility and related problems)it seems Auftraggeber means the one who manages over smth in this context..is it?
Well, if you are looking for evidence of the opposite theory (a truly proportional, not inverse-proportional relation between fertility and economic problems) you might find this: http://www.hartz-iv.info/news/2011/03/13/foerdert-hartz-iv-die-geburtenrate/what counter evidence?