How and why do we compare drugs to standard of care during clinical trials?

How and why do we compare drugs to standard of care during clinical trials?
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I think it’s useful to think separately about the % effectiveness of the new drug and the drug company’s decision to produce it. The costs to finish bringing the new one drug to market might not have any chance of getting repaid if sales would only to the folks who didn’t respond to the other one. Seems like I’ve seen ads about drugs for folks who don’t get much use out the usual medication, or it needs a boost, ask your doctor about this kind.
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