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A good questionnaire makes it convenient for the
respondent to reply. Mail surveys that include a
self-addressed stamped reply envelope get better response
than business reply envelopes. Some investigators have
suggested that people might feel obligated to complete
the questionnaire because of the guilt associated with
throwing away money--that is, the postage stamp. Others
have pointed out that using a business reply permit might
suggest advertising to some people. Another possibility
is that a business reply envelope might be perceived as
less personal.
A meta-analysis on 34 studies comparing stamped versus
business reply postage showed that stamped reply
envelopes had a 9 percent greater aggregate effect than
business reply envelopes. In another meta-analysis on
nine studies, an aggregate effect of 6.2 percent was
found.
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