
A scam is a kind of fraud. It works by first gaining the trust of the victims, and then either asking them for money, or other things, or asking them to commit fraud. For this reason, scams are also known as confidence tricks. Researchers have defined confidence tricks as "a distinctive species of fraudulent conduct ... intending to further voluntary exchanges that are not mutually beneficial", as they "benefit con operators ('con men') at the expense of their victims (the 'marks')".
The shell game dates back at least to Ancient Greece. William Thompson (1821–1856) was the original "confidence man". Thompson was a clumsy swindler who asked his victims to express confidence in him by giving him money or their watch rather than gaining their confidence in a more nuanced way. A few people trusted Thompson with their money and watches. Thompson was arrested in July 1849. Reporting about this arrest, James Houston, a reporter for the New York Herald, publicized Thompson by naming him the "Confidence Man". Although Thompson was an unsuccessful scammer, he gained the reputation as a genius operator mostly because Houston's satirical tone was not understood as such. The National Police Gazette coined the term "confidence game" a few weeks after Houston first used the name "confidence man".
In Confessions of a Confidence Man, Edward H. Smith lists the "six definite steps or stages of growth" of a confidence game. He notes that some steps may be omitted. It is also possible some can be done in a different order than the one shown or carried out simultaneously.
In addition, some games require a "corroboration" step, particularly those involving a fake, but purportedly "rare item" of "great value". This usually includes the use of an accomplice who plays the part of an uninvolved (initially skeptical) third party, who later confirms the claims made by the con man.
Fraud has rapidly adapted to the Internet. The Internet Crime Complaint Center (IC3) of the FBI received 847,376 reports in 2021 with a reported loss of money of $6.9 billion in the US alone. The Global Anti Scam Alliance annual Global State of Scam Report, stated that globally $47.8 billion was lost and the number of reported scams increased from 139 million in 2019 to 266 million in 2020.
Government organizations have set up online fraud reporting websites to build awareness about online scams and help victims make reporting of online fraud easier. Examples are in the United States (FBI IC3, Federal Trade Commission), Australia (ScamWatch ACCC), Singapore (ScamAlert), United Kingdom (ActionFraud), Netherlands (FraudeHelpdesk). In addition, several private, non-profit initiatives have been set up to combat online fraud like AA419 (2004), APWG (2004) and ScamAdviser (2012).
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