Strategy		Incentive		Mode of initial contact^f
Experimental arm #	Brief description	Pre-	Promised	Mode of initial contact^f
1	Standard	$10 Target gift card		FedEx
2	USPS standard	$10 Target gift card		USPS
3	Cash pre	$10 cash^d		USPS
4	$40 Target promised		$40 Target gift card	FedEx
5	$60 Target promised		$60 Target gift card	FedEx
6	Check promised		$40 check^e	FedEx
7	Electronic promised^a		$40 Electronic	FedEx
8	Combination	$2 cash^d	$40 Target gift card	USPS
9	ATP report^b	$10 Target gift card		FedEx
10	Email-less^c	$10 Target gift card		FedEx