Why is the medical model so resilient?

If we all agree that the medical model is outdated, why is it so resilient? This was one of the most insightful questions at the recent thought-provoking workshop for the Rethinking Medicine programme.

It was asked by Chris Van Tulleken, now a well-known media doctor, but back in the day a peer of mine at medical school. 
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It prompted me to reflect more on the nature of the medical model, my own experience of it as a GP, and why it’s so pervasive.