Given a sentence in Tagalog language, translate the sentence to English language keeping the meaning of the original sentence intact.
Q: Tagalog sentence: Gastos ng advertising ay isa ring kadahilanan. Word-ng-bibig ay malawak na ginagamit sa iba't-ibang mga kumpanya.
A:
Cost of advertising is also a factor. Word-of-mouth is widely used in various companies.