If you are looking for a hotel room you may very well see announcements like "Last chance! Only 1 room left!" or "Only 1 room available for €x". You do not need to take this kind of communications seriously, certainly not at Booking.com.
A complainant submits to the Dutch Advertising Code Commission that Booking.com on its website often creates the illusion that the supply of rooms in specific hotels or at a specific rate is (very) scarce. They also