As we've gone on in this thread, you've provided an increasing amount of actual details on how this works (thanks!) and now express knowledge of external sources that back this up (though citations to those would be useful). Your initial claim read to me as just, "it's simple free market incentives", which is not the same as the more full picture we've gotten as we've gone on, which now includes more analysis of how the Medicare incentive might play out for different decision makers. I feel like that was peoples' point (at least it was mine): an indirect "follow the money and don't worry about why it works the way it does" argument was not sufficient. So thanks for taking the time to fill in a bunch of gaps!

I still think you may be downplaying the impact of the risk calculation hospitals have to make regarding their ability to receive the stipend now or in the future. It may be only 80k, but clearly that 80k is enough to incentive many hospitals to have residents, so it must be material to them to some extent.

Your point about increasing supply of doctors being in hospitals' interest in the long run is interesting, but this is the same training conundrum everyone has: it is often difficult to make the decision to invest in the near term when the payoff is not realized until much later.

I'm sure you're right about all this in general - training people is a tricky and expensive problem for every industry.