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Really, there’s nothing specifically wrong with having a low birth rate. On a large scale, we have an overpopulation problem, and there’s not really a negative for each person having fewer children. Of course, smarter people will decide to have fewer kids. But eventually, it will all balance out.
The primary reason an MRI is expensive to run is that it has this magnetic field that must be maintained. This is a cost that is irrespective of whether they are running a scan.
So if you have an MRI for small animals and it’s not being used, you might use it for a hamster.