Hotel booking sites are to be probed by the UK's competition watchdog to see if consumers are being misled by them.
The CMA said it was "concerned about the clarity, accuracy and presentation of information on sites".
The investigation will examine areas such as hidden charges, search results, and discount claims.
Leading booking sites include Expedia and Booking.com.
According to the CMA, about 70% of people who shop around for accommodation use hotel booking sites.
It will look into how search results are ranked, and it also wants more information on whether extra charges, such as taxes and booking fees, are clearly displayed.
Another area being looked at is the way sites display how many rooms are left, how many people are viewing a particular hotel and messages that claim to state the last time at which a similar room was booked.
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