<prompt> Translate the following text to EnglishKubadilishana vitu kwa vioo vya macho ni busara kwa muda mrefu kama gharama ya kutoa vitu ni chini ya thamani ya vioo vya macho kwa watangazaji.  <response>: Exchanging stuff for eyeballs makes sense as long as the cost of providing the stuff is less than the value of the eyeballs to advertisers. 