The $2 bill is commonly used as a prepaid incentive in survey administration. Despite the widespread use of this incentive, there is no peer-reviewed research into how providing a single $2 bill rather than two $1 bills affects survey response rate. The results are from a mail survey of 2,970 rural landowners in Michigan with identical survey protocols. Half were randomly assigned to receive a single $2 bill and the other half to receive two $1 bills accompanying the questionnaire. I found no statistical difference in the response rates of the two groups. While there may be logistical advantages to using a single $2 bill compared to two $1 bills, this research suggests that the $2 bill is not more effective at inducing survey participation.
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