In the USA we seem to have lots of drug commercials. In some of them there is reference to a discount on the prescription if you have insurance.
For example [Jardiance](https://www.jardiance.com/heart-failure/savings-support), a type 2 diabetes drug offers a copay as low as $10 if you meet the qualifications.
Why does a consumer need insurance for this discount to apply? Who pays for the difference in cost?
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