In a case study, psychologists found that horse racing fans become more confident that their horses would win after placing a bet. Which principle of influence does this example illustrate?

Consistency.

Explanation:

The principle of influence is consistency; in psychology, it refers to the tendency to justify or establish coherence between the thought and the actions performed. It is a way to reduce cognitive dissonance .

In this case, people after betting to reduce their cognitive dissonance have more confidence that they will win since they already made the bet.

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