Barrons : Big Pharma Stocks Need a Rethink. Investors Keep Making the Same Mista Big Pharma Stocks Need a Rethink. Investors Keep Making the Same Mistake.Pfizer’s patent expirations are great for humanity but terrible for investors. It’s a common story across the pharmaceutical industry. see attached Download Big_Pharma_Stocks_Need_a_Rethink._Investors_Keep_Making_the_Same_Mistake._-_Barron_s.pdf