highly significantp = 0.001
Our data confirm that blowing the whistle is indeed effective in increasing the average proportion of reported income, being equal to 0.65 in the treatments in which subjects cannot signal others’ choices to the tax authority ( NoWhistle_NoInfo and NoWhistle_Info ) and equal to 0.80 in the treatments including the whistleblowing stage ( Whistle_NoInfo and Whistle_Info ), with this difference being highly significant ( p = 0.001, MW).