ilamont/advertising

From the page: "Here comes the fun part -- remnant inventory. If a publisher (website owner) can't sell all the advertising impressions generated in a given month by users looking at its Web pages, then ... they have to put something in those open ad-spaces, or the inventory goes to waste, and the publishers don't get paid for it. Most publishers would rather take 10 cents on the dollar for that space than have it go empty. However, some publishers want total advertising control -- to avoid offending users for example -- so they'll only publish ads from known brands."