Robust reversals of preference were

Robust reversals of preference were obtained. On average, only 41% of the
respondents who stated different WTP for the two items indicated greater willingness
to pay for the public health problem.4 However, 66% of responses favored the
public health issues in the choice condition. The difference between the two
conditions was statistically significant separately for each of the seven pairs of
items. A different pattern was observed in five other pairs of issues, in which the
two issues were drawn from the same category. In these control pairs, the
proportions favoring one issue over another were quite similar in choice and in
SWTP.