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You might not agree on the last point I made, but there are multitude of services or technology which more than make up for a lessened supply of blood, as well as other services, paticularly life saving devices, which do not involve death from a loss of blood (e.g, defribulators for paramedics). The main problem with your argument is not the existence of effective substitutes for blood, it is the assumptions that precede it - for example, that even though introducing commercial relations into blood supply will reduce blood quality and supply, and/or increase the cost of procuring good quality blood, it will increase choice, which will convert into greater utility, which will then generate into an increase in purchasing power sufficient to more than offset the problems of lower quality and higher cost blood.
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