The benefits of a given business-related action are calculated, and then the costs associated with taking that action are subtracted.
You can describe in general terms the costs associated with using employment agencies or the media.
Also you can describe the benefits which may include saving management time or having a wider range of candidates available.
Which of these media outlets would be useful for Pimlico Plumbers?
Why?
Search 'UK Internet Recruitment'
Are there many websites available for businesses wishing to recruit?
What would be the costs and benefits of using an online recruitment website?
Newspapers:
I think the Metro would be ideal for Pimlico Plumbers.
Can you find out the costs and benefits of advertising in the Metro?
Magazines:
Are there any specialist magazines for plumbers? How much would it cost to advertise in one of them?
Radio:
talkSport or LBC would seem ideal radio stations to advertise Pimlico Plumber vacancies.
What would be the costs and benefits of using a commercial radio station for advertising job vacancies?
Television:
I don't think advertising on ITV would be appropriate.
What do you think?
What about a more specialised channel on Sky or Freeview?
Agencies:
Google 'recruitment agencies'.
What services do they offer?
job centre plus:
Remember you are discussing costs and benefits.