In 2011, "Freakonomics Radio" reviewed sparse data about hitchhiking, and identified a decline in hitchhiking in the US since the 1970s, which it attributed to a number of factors, including lower air travel costs due to deregulation, the presence of more money in the economy to pay for travel, more numerous and more reliable cars, and a lack of trust of strangers. Fear of hitchhiking is thought to have been spurred by movies such as "The Texas Chain Saw Massacre" (1974) and a few real stories of imperiled passengers, notably the kidnapping of Colleen Stan in California. See , below.