Research: cost per click for Amazon search ads was $1.16 in May, up from $0.75 YoY; eMarketer says Amazon’s ad revenue in the US will cross $20B this year (Spencer Soper/Bloomberg)

Spencer Soper / Bloomberg:
Research: cost per click for Amazon search ads was $1.16 in May, up from $0.75 YoY; eMarketer says Amazon’s ad revenue in the US will cross $20B this year  —  – Rates in May rose 50% from a year earlier, signaling profits  — Merchants look to raise prices to cover cost of visibility