A couple of interesting ideas surfaced during a discussion about pricing for high quality inventory on the exchange.
My hypothesis is that since the exchange is doing a higher level audience aggregation than any publisher, it is reducing the value of the audience aggregation done by the publisher. When using advertiser or 3rd party data to aggregate audiences on the exchange, the value of audience aggregtion is provided by the exchange and the data providers. The publisher's value then reduces to providing content that generates high audience engagement -- which means the inventory should really be valued much lower than the typical direct sales pricing. In turn, this translates to schemes like unbranded inventory on the exchange to prevent channel conflict.
I believe that ad inventory that has good placement on high quality content pages is limited. For example, on the Google exchange only about 10%-12% of the inventory is identified as above the fold, while about 40% of the inventory placement is unknown. If we extrapolate from the known above the fold vs. below the fold distribution, perhaps about 20% of all inventory on the exchange is above the fold, and perhaps 25% of that inventory is on high quality publishers. That is a fairly small segment of the total inventory, and it is essential for the exchanges to develop schemes to help sustain appropriate pricing for that inventory.
Reserve price by impression
The simplest option is to put in a reserve price by placement for ad impressions. A branded, above the fold 300x250 placement may have a reserve price of $5 CPM, while the same location, if unbranded, may have a reserve price of $3 CPM. Reserve pricing for impressions is already in place for the exchanges that matter.
Reserve price by audience segment
Another option would be to support reserve price by audience segment. If the publisher is creating content that aggregates certain segments, then it makes sense to place a premium on tapping that audience in the current audience oriented buying environment. The challenge would be in managing the segments since there are no standards for audience segments, and there is unlikely to be except at the high level demographic characteristics. Also the advertiser may value a user for reasons completely unrelated to why the publisher values the user. For example, cafemom.com may value a segment of their audience as moms between 25 yrs and 35 yrs. The advertiser may value some members of that audience because they are interested in luxury travel.
This mismatch should not be a problem. The publisher will set a reserve based on what the publisher believes is the media value of that audience segment. If the publisher believes moms in the 25-35 age group are worth $8 CPM for the CPG companies, then that should be the reserve price set by the publisher. If Carnival Cruise decides that some members of that audience are worth more to them, then they should buy impressions. If not, they should try to find that audience somewhere else.
If there is enough market demand for that audience segment at the reserve price, the publisher's inventory will sell out. If not, a different strategy would have to be developed to get the most revenues out of the excess inventory. For example, the same impression could be put up for multiple auctions with different information about the user. One auction could be for [mom, 25-35], which another could be for [female, 25-35]. There will have to be two levels of auctions to determine the final winning bid – creating a more complex exchange.
Reserve price by audience segment and placement
It would appear that the right approach for the publishers would be to set reserve prices using a combination of placement and audience segment information. This scheme puts the onus on the publishers to provide more data about each auction -- both placement and audience. I find it unusual that Google has to use technology to infer that a placement is above the fold or below the fold when the publisher could easily provide that information -- at least for the publishers aspiring to get a high price for their inventory. This lack of data from the publishers has crceated a slew of ad verification vendors who claim to provide information about the visibility of the placement and brand safety. Information regarding visibility and brand safety should come direct from the publisher. An infrastructure provider like Google should only have to audit this data periodically to make sure that the publisher is compliant with the requirements.
Having to provide the audience data would create work for the publishers. They would have to work with data providers like Targus and Exelate to segment their audience, and provide that data for every auction. There will be technical challenges in moving that additional data through the exchanges handling billions of auctions per day. And there has to be some method of auditing the quality of data provided the publishers. None of this is trivial, and the value has to be significantly higher than the work involved to make it worthwhile.
Will media buying on the exchange move in this direction?, and provide that data for every auction. There may also be technical challenges in adding a bunch of data to the billions of auction requests flowing through the eexchanges.