The Reich effect is a term used to describe the psychological phenomenon in which a person becomes more likely to agree with a particular statement or belief simply because it is repeated numerous times. This effect is named after the psychologist Wilhelm Reich, who studied the ways in which propaganda and persuasion techniques can influence people's attitudes and opinions.

When a person hears a statement multiple times, it can create a sense of familiarity and credibility, leading them to be more inclined to accept it as true. This effect can be exploited in propaganda and advertising to shape public opinion and behavior. The Reich effect highlights the powerful impact that repetition and reinforcement can have on shaping our beliefs and perceptions.