4 ideas
Dr Parpalaid sells Knock a rural practice with almost no patients, believing the district is simply too healthy to support a doctor. Within three months Knock has turned the canton into a sick population. He offers free Monday consultations, gets the schoolteacher Bernard to lecture on germs and the pharmacist Mousquet to profit from prescriptions, and converts the local hotel into a clinic.
Knock's founding premise is that health is not a state but an undiagnosed condition. Once 'well' is redefined as 'not yet examined', every person becomes a potential client and the expert's market becomes the entire population. The move works by shifting the burden of proof: the layperson can no longer show he is healthy, only that he has not yet been found ill.
Knock builds demand in three moves. A free first consultation lowers the cost of entry and produces a diagnosis the patient then pays to manage. Local figures of trust are recruited and given a stake, such as the teacher, who spreads fear of microbes, and the pharmacist, who sells the remedies. Treatments are prescribed as daily rituals like temperature-taking and bed rest, so belief in the illness is renewed every day rather than decided once.
Parpalaid treats the district's lack of illness as a fixed market condition, while Knock treats it as an opportunity not yet developed. Seen this way, the size of a professional's clientele measures how well the profession has taught people to see themselves as needing it, not how much need exists. Knock also asks patients about their land and income before settling on the severity of the treatment, which shows that what is prescribed tracks what the client can pay.