Earlier quoted context omitted.
The most economically efficient way to pay for B is to allow the free market to drive the cost of care so low that the person is either able to pay for it, or the cost through charity is trivial. This has the double benefit of not attempting to rectify one moral wrong (person does not receive care) by committing another (violent coercion by the state).
The most economically efficient way to pay for B is to allow the free market to drive the cost of care so low that... Talking about free market efficiencies is a bit like talking about the effect of Newtonian forces on a spherical cow. Very useful to learn from in an undergrad setting but rarely sufficient to capture real world systems. What you actually want from policy is something like a trajectory toward the best…
What I don't want from policy is you* deciding for me what results should be aimed for and then forcing me to maximize your personal pet project. If you have good arguments that something should be funded, you don't need to force me to do it.
*: The you here is proverbial. Feel free to insert Donald Trump as an example of the type of person who would have a say in my healthcare options.