Demand increases with disposable income providing a product or a service that is a want or a need.  If a want or a need is not being filled it is unlikely a business is sustainable regardless of wage cost.

Many Canadians have difficulty finding a physician and a nurse practitioner would enable them to see more patients.  The problem of access, particularly in rural Canada, is high and in order to contain costs and improve access it may be that nurse practitioners, under the supervision of a physician, might alleviate the situation.