About 15 years ago a friend of mine, who's a physical therapist originally from Canada working in the US, made an interesting observation.

In Canada, MRI machines were available only at a few major hospitals. It took months to wait to use one. In Chicago, where we were living at the time, she said it seemed as if there were an MRI machine on every block.

I think the situation is different now, but I think the observation is quite telling.