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Brad Brewer posted on Google+ a new feature Google must be testing in the Hotel Finder search results. The new feature is that Google is showing if a hotel price is a good deal or not. Google is using historical pricing to tell the searcher if the hotel price for the night they want to stay is a good price relative to the typical nightly cost of the hotel.
Here is a picture from Brad, which I cannot replicate myself:
You can see, it says "Good deal - $107 below estimated market rate" on the listing for the Embassy Suites.
Now that is a useful piece of information.
Forum discussion at Google+.
