Let's say a company that makes a consumer product such as laundry detergent asks customers to write a testimonial about the product in exchange for a small chance of winning a small prize. what does cognitive dissonance theory predict will happen to consumers who participate and write the testimonial?

Cognitive dissonance theory states that there is tendency for individuals to seek constituency  among their cognition. This theory believes that when there is inconsistency in behavior or attitude something must happen to eliminate them.
In the scenario given above, using the cognitive dissonance theory, it can be predicted that the individuals who participated will value social norm over personal norm and will tend to give testimonies that are contrary to their personal feeling about the product.

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