Your data on changing stock prices for five pharmaceutical companies from 1997 to 2010 (Nature 480, 16–17; 2011) erroneously indicate a 39% drop in aggregated share value, when in fact it would have risen by 82% (see Correction, Nature 480, 425; 2011). The error was due mainly to the selection of unadjusted, rather than adjusted, stock-market closing prices. (Correspondence)
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/pharmaceutical-industry-investors-unfazed-drug-patent-expiry
[2] http://admin.indiaenvironmentportal.org.in/category/author/david-brindley
[3] http://admin.indiaenvironmentportal.org.in/category/author/brock-reeve
[4] http://admin.indiaenvironmentportal.org.in/category/author/chris-mason
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drug-industry
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/patents
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drugs
