Sales · The rule of three advertising exposures, In 1972, Herbert Krugman published “Why Three Exposures May Be Enough”: he theorised that three exposures to an advertising message are enough to move the consumer from curiosity (“what is it?”) to evaluation (“what's in it for me?”) and then to decision. The Naples report of the Advertising Research Foundation (1979) refined this model: effectiveness peaks between three and eight exposures. This framework, still taught in media planning, explains why repeated jingles and slogans embed themselves durably, an industrialised repetition of Zajonc's mere-exposure effect.
Politics · Cato the Elder and “Carthago delenda est”, In the 2nd century BC, Cato the Elder ended every one of his speeches in the Roman Senate, whatever the subject, with the phrase “Carthago delenda est” (“Carthage must be destroyed”). This obstinate repetition, hammered home for years, kept the Carthaginian question at the forefront of the political debate and turned an opinion into an inevitable certainty. Historians agree in seeing this rhetorical hammering as a decisive factor in triggering the Third Punic War (149 BC) and the final destruction of Carthage.
Diplomatic · The ritual recap as an anchor of agreement, In multilateral and cross-cultural negotiations, a well-established diplomatic practice consists in repeating and restating the point of consensus at the end of each session, the summing-up technique. By systematically recapping what has been secured in the same terms, the session chair turns fragile agreements into shared references that are hard to call into question in the next round. This resort to repetition invents no fact: it exploits processing fluency to solidify what has been conceded, each party ending up taking for granted what it has heard several times.
Judicial · Johnnie Cochran and the anaphora of the O. J. Simpson trial, During his closing argument at the O. J. Simpson trial (1995), the lawyer Johnnie Cochran tirelessly repeated the phrase “If it doesn't fit, you must acquit”, about the glove found at the scene. Rhetorical analyses of the trial note the massive use of anaphora and repetition, certain keywords recurring more than six times in the same argument. This rhythmic hammering etched doubt into the jurors' minds and gave the argument a mnemonic force that the bare facts would not have had. The jury returned an acquittal.
Business · The buyer's broken record in supplier negotiation, In procurement negotiation, the broken-record technique is a direct application of repetition: faced with successive counter-proposals, the buyer calmly restates, without ever losing their temper or arguing further, the same constraint: “Our budget ceiling is X, it will not move.” Practitioners of principled negotiation observe that this constancy exhausts attempts to increase the figure: the supplier stops testing the limit because it has been stated identically five times in a row. Here, repetition serves less to persuade than to render a red line credible through its very stability.
Everyday life · The parent's educational anchoring, A parent who wants to establish a rule, “Homework comes before screens”, repeats it every day, in the same terms, until it is no longer debated but internalised as a self-evident part of the household. This case illustrates the constructive side of the mere-exposure effect: the constancy of the message, more than its justification, creates the familiarity that makes it accepted. The rule ceases to be perceived as an imposed constraint and becomes a natural framework, provided that the repetition remains calm and consistent, without turning into nagging that would produce the opposite effect.
