In Festinger and Carlsmith's (1959) famous study on cognitive dissonance, participants who received $20 (versus $1) enjoyed the study more.

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Participants who received $1 for lying about the study being enjoyable reported more enjoyment than those who received $20, because the lower amount was insufficient to justify their lie, leading to cognitive dissonance and a subsequent change in their attitudes to align with their behavior.

In Festinger and Carlsmith's (1959) Famous Study on Cognitive Dissonance