Some airline ticket booking sites still track you and increase the ticket price on return visits, optimised to certain intervals. Many in the industry call it "dynamic pricing."
It made the news a few years back[1] but you can still see it sometimes in a few different industries. You can get into arguments with people about whether marketing as a whole is an enterprise built on manipulation, but this is quite clearly manipulative.
It's interesting that Amazon tried this in its very first years, but had to give up due to customer backlash. I wonder why the practice survives in travel services.
It made the news a few years back[1] but you can still see it sometimes in a few different industries. You can get into arguments with people about whether marketing as a whole is an enterprise built on manipulation, but this is quite clearly manipulative.
[1]: https://www.theguardian.com/money/blog/2010/aug/07/computer-...