What is the name of the theorem that explicitly says: "Phenomena do not have to be real to be real in their consequences"?

Question

Quizplus · Accepted Answer

The Thomas theorem, formulated by W.I. Thomas, states that "if men define situations as real, they are real in their consequences." This means that the perception of a situation affects the way people respond to it, regardless of the objective reality of the situation.

What Is the Name of the Theorem That Explicitly Says