airlines use a computer algorithm to raise prices every single day. they call it dynamic pricing and companies use it to stretch out every penny from consumers. there are people who don't like that, but have done something about it.
the founders and creators of decide.com sold their first company to BING, which helps the search engine determine what is the best price for airline tickets and if those tickets are expected to rise. decide.com has the same idea, but is for a wide variety of products.