
The research forecasts that desktop online display revenue will start to decline marginally after 2018. Mobile display advertising is projected to grow by 34.9 percent a year and tablet display advertising by 22.9 percent a year. By 2020, smartphones and tablets will account for 64 percent of the online display ad spend in 2020. Smartphones are expected to show the strongest growth, reaching EUR 6.4 billion in 2020, compared to EUR 1.4 billion in 2015.
Forrester also expects ad blockers to continue growing in popularity, constraining revenue growth for publishers. In the second quarter, there were 77 million active users of ad-blocking software in Europe, 35 percent more than in the year-earlier period. Ad blocking costs the advertising industry an estimated USD 21.8 billion globally in 2015.