Earlier quoted context omitted.
Didn't the price of insulin in the US nearly triple in 10 years? The market is not always particularly efficient.
One of the counterpoints is that it's not the same insulin, it's constantly new and improved insulin that functions better than the insulin we had 10 years ago, but of course each improvement comes with a price increase.
Apologies for citing Business Insider. It was just conveniently on the first page of Google search results.