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"One of the ideas I had discussed in The Poverty [of Historicism] was the influence of a prediction upon the event predicted. I had called this the "Oedipus effect", because the oracle played a most important role in the sequence of events which led to the fulfilment of its prophecy. . . . For a time I though that the existence of the Oedipus effect distinguished the social from the natural sciences. But in biology too -- even in molecular biology --expectations often play a role in bringing about what has been expected" (Karl Popper, Unended Quest: An Intellectual Autobiography, 1976).
The concept is linked to the power of positive thinking. ie If you think it will happen it will.