Freakonomics had an episode with some econ professors who claimed their research with eBay showed targeted ads are not worth the cost. https://freakonomics.com/

Freakonomics had an episode with some econ professors who claimed their research with eBay showed targeted ads are not worth the cost. https://freakonomics.com/podcast/does-advertising-actually-work-part-2-digital-ep-441/ https://freakonomics.com/podcast/does-advertising-actually-w...