How much needs to be spent on health care

How much needs to be spent on healthcare? What do various scholars and academics say on the topic?

What is their reasoning?
What factors influence healthcare spending (not political)? By that I mean for instance demographics and

other such factors.
Is it likely that healthcare costs are going to go up in Western societies? Why?I am also more interested in

how much a nation needs to spend on health care as a percentage of GDP. You start of with an example of

an individual and that is fine

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