Controlled experiments provided evidence that (1) employees are more l
ikely to accept incentive contracts described in bonus terms than cont
racts that appear identical except for being described in penalty term
s, and (2) when employees' judgment of their past performance is depen
dent on memory, the preference for bonus over penalty contracts increa
ses with experience. These phenomena are explained in terms of the hum
an information processing costs of communicating and evaluating the co
ntract terms, and further implications are drawn for the empirical stu
dy of contracting.