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Figure 5 | BMC Health Services Research

Figure 5

From: Price regulation, new entry, and information shock on pharmaceutical market in Taiwan: a nationwide data-based study from 2001 to 2004

Figure 5

Market structure of major market of NSAIDs for RA/OA treatment, quarterly, 2001-2004. Number of products and drug companies that contributed to the top 80% NSAIDs market was plotted across time. Herfindahl index of concentration (HHI) was also provided to further estimate the effect of policy interventions on market structure of NSAIDs over time.

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