I don't have the model, but it's actually not that complicated to create. I've done it in two different areas.
One was looking at health expenditures. We broke it out into inflation and demographics and volume changes. We then broke it into federal-provincial-territorial breakdowns. We broke it into components. Basically, that's the model.
I did a similar one looking at the number of doctors we needed in Ontario. We looked at how many we could create, through the diseases, the risk factors, the demographics of the population.
It's quite straightforward, but it's also quite an expensive proposition to undertake. The benefits are that ultimately the conversation changes from how many we have to what we can do about making those changes.