I don't think it's simply the lack of consumer price comparison that is making it easy for Amazon to front ads without consequence. I think it's also that for m

I don't think it's simply the lack of consumer price comparison that is making it easy for Amazon to front ads without consequence. I think it's also that for many different consumer products, consumers don't know precisely what they want, or more particularly, how to model their requirements. If they knew their precise requirements, they would easily be able to judge whether or not a given ad was fronting a product actually is the right one for the job (that sometimes happens), as well as whether or not the products were a good deal. It would be interesting if there was a repository of the performance specs for different common household products. Right now it's the job for critics and reviewers to be the experts here, but how difficult would it be to simply read a five minute primer on the theory of detergents or the theory of headphones and then go out shopping with impunity?