in the early 1940s, the introduction of penicillin ushered in a new era of antibiotics—powerful medications that can stop infections caused by bacteria. When the war broke out, the U.S. military needed great quantities of penicillin to administer to the troops, and companies like Pfizer were enlisted to produce the drug. By the time the war ended, the business model of these chemical companies had forever changed: now they were mass-producing not just chemicals but finished drugs, which were ready for sale. Penicillin was a revolutionary medicine, but it wasn’t patented, which meant that
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