Online advertising is going to overtake radio in the advertising market, MediaGuardian reported today.

Richard Wray’s article stated that while Carat – part of the Aegis marketing empire – had reduced its forecasts for the global advertising markets for 2008/9, it also said online advertising will continue to grow, overtaking radio as the third most popular advertising medium after TV and newspapers and magazines.

MediaGuardian’s report is interesting to look at in the light of statistics made available last week by the Online Publishers Association (OPA).

The US-based figures suggest that ‘consumers on all three types of local media sites – newspapers, television stations and magazines – are more likely to take action after viewing a local advert than visitors on all other local content sites’.

As part of the OPA study, JupiterResearch surveyed 2,069 US online consumers ‘who qualified as Local Online Content Users, by currently using online yellow pages, newspaper, TV, magazine, city guides, user review sites, portals or classifieds for local information.’

Here’s the breakdown:

Per cent of consumers taking action after viewing local adverts

• Local Newspaper Site: 46%
• Local Television Site: 44%
• Local Magazine Site: 42%
• User Review Site: 39%
• Portal: 37%

Click here to view the full report and follow this link for the press release.