Incentive Condition	Total Costs	Total Cost per 100*	Costs per Complete (C)	Response Rate (RR)	Incremental Response Rate (IRR)**	Incremental Cost (IC)***	E (IRR/IC)
$2 pre-incentive	$1,965	$655	$15.35	48.50%	--	--	1
$10 post-incentive	$3,973.60	$794.72	$26.67	33.50%	-30.93%	21.33%	-1.450070323
$20 post-incentive	$2,408	$1,204	$34.40	42.40%	-12.58%	83.82%	-0.150083512