MarketingDUAL-USE

Mere Measurement Effect

What it is

The act of asking people about their intentions changes their behavior — simply measuring purchase intent increases actual purchases.

How it works

When asked "Do you intend to buy a new car this year?" people are more likely to actually buy one, even controlling for pre-existing intent. The question creates a mental commitment, primes the behavior, and makes the purchase more cognitively accessible. Surveys and polls are not just measurement tools — they are influence tools.

Real-world examples

  • •Customer satisfaction surveys that ask about repurchase intent, which then increases repurchase rates.
  • •Political polling that asks about voting intention, which increases actual voter turnout for the polled group.
  • •Market research asking about product preferences that subsequently influences purchase behavior.

Ethical guidelines

Where the line is

Asking people about their intentions can help them act on their own goals. It becomes manipulation when questions are engineered to plant an intention the person did not have, or to commit them before they have decided.

  • ●Researchers and marketers should acknowledge that measurement alters what is being measured.
  • ●Surveys designed primarily to influence behavior rather than gather information are manipulative.
  • ●Informed consent for surveys should include awareness that the survey itself may influence behavior.

How to defend against it

  • ►Be aware that answering questions about your intentions can change your behavior.
  • ►When completing surveys, recognize them as potential influence tools, not just neutral data collection.
  • ►Don't let questions about your future behavior create commitments you haven't deliberately made.

References

  1. Morwitz, V. G., Johnson, E., & Schmittlein, D. (1993). Does measuring intent change behavior?. Journal of Consumer Research, 20(1), 46–61
    The founding demonstration and the entry's own example: households asked about their intent to buy an automobile (or a personal computer) were subsequently more likely to buy one than comparable households that were not asked — measuring intent changed behaviour.
  2. Sherman, S. J. (1980). On the self-erasing nature of errors of prediction. Journal of Personality and Social Psychology, 39(2), 211–221
    The social-psychology precursor: asking people to predict whether they would perform a socially desirable act made them more likely to actually do it, the commitment-and-accessibility mechanism the entry describes.
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