 Changes in perceived risk result in risk compensation—correspondingly more or less mitigation, including precautionary measures and support for regulation.Kuran and Sunstein offer three examples of availability cascades—Love Canal, the Alar scare, and TWA Flight 800—in which a spreading public panic led to growing calls for increasingly expensive government action to deal with risks that turned out later to be grossly exaggerated.Others have used the term "culture of fear" to refer to the habitual achieving of goals via such fear appeals, notably in the case of the threat of terrorism.