Are sites using cookies to raise prices?

Question: Is it true that sites are using cookies to raise prices? Every time I come back to book a ticket I’ve looked at before it seems the site has raised the price by €10. Is this because they use cookies to track me?

Why is Avionero needed?

Question: You claim the presumptions of current sites are wrong, but they still seem to be doing pretty good. Do you have any statistics to back up your claims?