Oddly Wired
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social influence

A small favor makes you say yes to big ones.

The foot-in-the-door technique increases compliance by securing a small, trivial commitment before asking for a substantial one.

Homeowners who agreed to display a small sign in their window were significantly more likely to agree to place a large, unattractive billboard in their yard two weeks later. Once you have committed to a small request, your self-image shifts to align with that behavior.

You justify later compliance by viewing yourself as a person who supports the cause.

Where this comes from

Study
Freedman and Fraser, 1966
What the check found
The claim correctly references the classic Freedman and Fraser (1966) billboard study, which is the standard empirical basis for the foot-in-the-door technique.
Confidence
Well replicated
social-influencecompliancebehavior

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.