Terrestrial radio (non-digital advertising only) is expected to be essentially flat with 0.6% growth annually.
Digital advertising revenue is expected to increase by 18% annually over the next five years.
That means digital will rise from 9% of overall ad revenue in 2015 to 19% in 2020. In other words,all the growth in radio ad revenue is likely to come from digital based on these metrics.
Another point: The non-digital estimates have terrestrial radio beating newspaper revenue by this year. Not because radio is rising, of course, but because, well, you know.
What’s also interesting is Jack’s statistic for what he calls “Internet originated audio,” which I assume means streaming and perhaps podcasting revenue. That rises at 22.9% annually, even more bullish than terrestrial radio digital advertising. In fact, Jack estimates that “Internet originated audio” advertising will top terrestrial radio digital advertising by THIS year and keep on rising.