Table 4.

Policy Comparisons

	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
	Additional verified users for 100 doses subsidized (Nb-Na)	Additional takers for 100 doses subsidized (Tb-Ta)	Doses fully subsidized per marginal user col (1)/ col (2)	Full-dose equivalent for inframarginal users (Table 1 col(3) × 1/2)	Full-dose equivalent subsidy for inframarginal users, per marginal user col (4)/ col (2)	Total additional doses provided per new user col (3) + col (5)	Cost per addi- tional DALY saved, USD*	Cost per addi- tional life saved, USD*
Policy change considered:
1. Cost-sharing to free delivery	21.5	86.6	4.03	6.70	0.31	4.34	182	5,520
2. Cost-sharing to vouchers	20.5	27.7	1.35	6.70	0.33	1.68	70	2,134
3. Vouchers to free delivery	1.00	58.9	58.9	0	0	58.9	2,475	74,921

Notes: Calculations reflect material cost of water treatment solution only; differences in delivery costs are not included. What we call a dose is a yearly dose (12 bottles of 150mL). At the time of writing the exchange rate is Ksh 103 to USD 1, thus a yearly dose costs 12×20 / 103 = USD 2.33.

^*See Supplementary Materials for assumptions used in calculations of costs per DALY and cost per life saved.