this assumes that health care scales in the same way that an online retailer does, no?

the retraining nurses is somewhat of a point in the opposite direction -- the NHS has an easy pool to pull in because of the inefficiency. if all of the nurses were being used efficiently to begin with, there would not be an easy group to bring in.

scaling the number of doctors and nurses available takes a bit more time than hiring a bunch of people to put items in boxes