This is often assumed without actual data to back it. I remember seeing in HN (in the last few years) a link providing evidence that advertising didn't work in

This is often assumed without actual data to back it. I remember seeing in HN (in the last few years) a link providing evidence that advertising didn't work in an instance where the company was sure it was working (for years). Sorry, my memory is not good enough to actually come up with the link, maybe someone else will remember...