Figure 5From: Price regulation, new entry, and information shock on pharmaceutical market in Taiwan: a nationwide data-based study from 2001 to 2004 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.Back to article page