Confidence trick

A confidence trick is an attempt to defraud a person or group after first gaining their trust. Confidence tricks exploit victims using their credulity, naïveté, compassion, vanity, irresponsibility, and greed. 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')".
Terminology.
Synonyms include con, confidence game, confidence scheme, ripoff, scam, and stratagem. The perpetrator of a confidence trick (or "con trick") is often referred to as a confidence (or "con") man, con-artist, or a "grifter". The shell game dates back at least to Ancient Greece. Samuel 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".
A confidence trick is also known as a con game, a con, a scam, a grift, a hustle, a bunko (or bunco), a swindle, a flimflam, a gaffle, or a bamboozle. The intended victims are known as marks, suckers, stooges, mugs, rubes, or gulls (from the word "gullible"). When accomplices are employed, they are known as shills.
Short and long cons.
A short con or "small con" is a fast swindle which takes just minutes, possibly seconds. It typically aims to rob the victim of a large sum of money.
A "long con" or "big con" (also, chiefly ) is a scam that unfolds over several days or weeks; it may involve a team of swindlers, and even props, sets, extras, costumes, and scripted lines. It aims to rob the victim of huge sums of money or valuables, often by getting them to empty out banking accounts and borrow from family members.
Stages of the con.
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.
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.
Vulnerability factors.
Confidence tricks exploit typical human characteristics such as greed, dishonesty, vanity, opportunism, lust, compassion, credulity, irresponsibility, desperation, and naïvety. As such, there is no consistent profile of a confidence trick victim; the common factor is simply that the victim relies on the good faith of the con artist. Victims of investment scams tend to show an incautious level of greed and gullibility, and many con artists target the elderly and other people thought to be vulnerable, using various forms of confidence tricks. Researchers Huang and Orbach argue:
Accomplices, also known as shills, help manipulate the mark into accepting the perpetrator's plan. In a traditional confidence trick, the mark is led to believe that he will be able to win money or receive some benefits by doing some task. The accomplices may pretend to be strangers who have benefited from performing similar tasks in the past.