Advertisers worldwide will spend $545.40 billion on paid media in 2014, according to new figures from eMarketer. Total media ad spending will increase 5.7%, eMarketer projects, more than doubling its growth rate of 2.6% from a year ago… On a long-term basis, digital channels will continue to drive advertising growth across the globe. eMarketer estimates that digital ad spending will increase 16.7% this year, totaling $140.15 billion and surpassing 25% of all media ad spending for the first time.