Adotas recently posted an interesting, albeit oddly written article on the value of the ad exchange. The real story seems to be the value of the vertical ad networks—with which I cannot agree more—but their analogy between mutual fund managers and ad exchanges is a fascinating one. They equate the ad exchange to a specialized mutual fund manager who can add real value to your portfolio and that is very true for the new breed of ad exchanges out there today. The scenario buy that they walk through truly highlights the value that an ad exchange can bring to a media planner. They point out that when an advertiser wants to maximize ROAS they need their media buyer (their agency folk) to create a balanced “portfolio” mixing direct investment in large targeted sites with the specialized engagement of the vertical ad networks and the broad reach from the many low cost remnant networks. The share of voice and audience is highest on the expensive premium sites, highly relevant on the vertical ad networks (vertical search sites for instance) and yet there is massive reach to be had across the broad remnant networks. It is the mix that is critical to getting the job done. This is how you nail the ROAS for a big branding campaign where audience engagement is a critical factor—and this is just what the exchanges are good at delivering. They have the mix all ready to go, you just need your media planner, your mutual fund manager, to recommend and execute that perfectly balanced portfolio and your investment will pay off. What an exciting time for interactive media!