I disagree, I would think that imaging centers produce comparable results. On the medical side, the substitute good isn't a different procedure, it's the same p

I disagree, I would think that imaging centers produce comparable results. On the medical side, the substitute good isn't a different procedure, it's the same procedure done by a different provider. Most people do not currently make any of those evaluations anyway, so as far as the consumer is concerned, they are de facto substitute goods since they have no rationale for making a choice.