Though much of the data on this website is behind a paywall (available to members only), some valuable data is free. Examples of free data are listed below:
Information on advertising spending can be found throughout this guide. This page is an attempt to consolidate some of that information. Please also check the Media Sources tab and sub-tabs for medium-specific sources.
While numerous organizations forecast advertising spending, three of the most well-known are:
Two other organizations that forecast ad spending are:
GroupM - GroupM typically has ad spending forecast information on their website. For more information, use the news databases (Factiva, etc.) or the Internet to search for summaries of their reports.
Zenith - Zenith charges for their full reports, but their website contains fairly detailed report summaries.