Based on a survey of over 700 leading marketer decision makers or influencers and with in-depth interviews with senior executives from leading companies throughout the interactive advertising ecosystem
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Bain & Company released Building Brands Online, a ground-breaking study and action plan on brand advertising online
From the results:
Value of Advertising Media
Media Quality: Reach vs. Call to Action
Expected Growth 2008 - 2011
Best Media for which Brand Objectives
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summary of this study on iab.net (31 pg., PDF)