Varying the monetary incentive in mail surveys: (1) does it change survey results? (2) can it create sample improvement opportunities?

THE MONETARY INCENTIVE TEST
• A two-cell live test compared the use of a $5 cash incentive to a $10 cash incentive.
• The test was conducted as part of the Year 2000 Mendelsohn Affluent Survey where 33,600 households received a packet with a new $5 bill and 8,400 households received a packet with a new $10 bill.
• All details of the two cells were identical except for the incentive.

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