accounting collectivelaboragreements commerce comptabilité constructionindustry constructionworkers costcontrol costeffectiveness coût economicaspects effectofinternationaltradeon employeefringebenefits europe1992 financiëleaspecten humancapital incomedistribution internationaltrade laboreconomics labormarket laborpolicy laborunions main-d'œuvre manpowerplanning measurement openandclosedshop personalkosten personeelsmanagement personnelmanagement rateofreturn restrictivepracticesinindustrialrelations salariesandfringebenefits statisticalservices wages wagesandlaborproductivity