. Author manuscript; available in PMC: 2009 Jun 2.

Published in final edited form as: Health Econ. 2009 Jun;18(6):727–742. doi: 10.1002/hec.1473

Table IV.

Concentration measures by sub market

		Private sector sales volumes		Private sector sales values
Sub markets	Population	3 Firm concentration ratio (%)	HHI^a	3 Firm concentration ratio (%)	HHI^a
Kilombero
Idete	10 511	84	0.26	90	0.35
Mbingu	9523	68	0.19	87	0.33
Mchombe	17 030	73	0.24	69	0.24
Ulanga
Minepa	7861	79	0.51	89	0.72
Lupiro	12 037	94	0.60	96	0.57
Iragua	4353	91	0.67	93	0.74
Kichangani^b	5188	100	1.00	100	1.00
Rufiji
Ikwiriri	19 232	89	0.42	92	0.47
Kibiti	24 244	85	0.27	87	0.34
Mchukwi	9029	96	0.83	98	0.87
Bungu	12 627	71	0.18	85	0.28
Jaribu	8707	69	0.18	75	0.24
Average	11 695	83	0.45	88	0.51

The Hirschman Herfindahl index (HHI) ranges from 0 (large number of competitors with small market shares) to 1 (single monopoly supplier).

In Kichangani only 1 private sector antimalarial provider was documented.

Sources: Population Data DSS systems, May 2001, Sales Data Retail Audits Feb/Apr and Jun/Jul 2002.