According to Guégen (2014), people are more likely to give blood once when they are asked to participate in a long-term blood donation program. This is an example of the

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The door-in-the-face strategy involves making a large request that is expected to be refused, followed by a smaller request. In this case, asking for long-term participation is the large request, and giving blood once is the smaller request.

According to Guégen (2014), People Are More Likely to Give