Does it matter to advertising investment levels if advertising is considered a fixed or a variable cost? / P. Conboy, E.W. Goddard, M. Mac cutcheon. -- Guelph : University of Guelph, 1992. -- 33 s. : 3 obr., 5 tab. -- (Working Papers Series 92/6. Department of Agric. econ. and business). investície poľnohospodárske * náklady variabilné