The Association of National Advertisers has sent a letter to Department of Justice to oppose the recent  Google-Yahoo (NSDQ: YHOO) search advertising pact. In the letter Bob Liodice President & CEO, ANA, mentioned that the oragnization’s opposition to the deal. It says that ANA came to the conclusions that after “a comprehensive, independent analysis, which included input from the Board’s members and face-to-face discussions with Google ( NSDQ: GOOG) and Yahoo”.

It say that Google & Yahoo partnership will control 90 % of search advertising inventory and states ANA’s concern that partnership will likely diminish competition and will limit the currently available choice and will like the online marketing pricing. There may be more to the letter (which it did not disclose fully) and its investigation, but the two aren’t combining all their inventory; Google will only have access to limited inventory from Yahoo against which to serve up its contextual ads.