Benjamin Franklin not only entered the history books as one of the founding fathers of the USA, but is also mentioned in many psychology textbooks. His ingeniously simple method of turning an opposing politician into one of his closest allies and friends received a lot of attention, especially from social psychologists. But does the Benjamin Franklin method really work? Or can the Benjamin Franklin effect not be proven in empirical studies...?
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Studies and books:

Jecker, J., & Landy, D. (1969). Liking a person as a function of doing him a favour. Human relations, 22(4), 371-378.

Burck, E. (2016). New psychology of influence: exploring manipulation. BoD Books on Demand.

Burck, E. (2019). The manipulated brain: psychology of unconscious influence. BoD Books on Demand.