US podcast advertising captured $314 million in revenue in 2017. A rise of 86% year over year.
The research predicts podcast revenue will surge to $659 million by 2020, a triple-digit 110 percent hike from 2017.
http://www.iab.com/podcaststudy2018
https://www.warc.com/content/paywall/article/event-reports/ford_has_a_newer_idea_podcasting/121260
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