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Interesting. So the core question seems to be: "How much value is produced by healthy blood donors making decisions to donate without incentives, compared to blood that's "brought"".
Bought blood has been subject of an interesting debate:
"Since increased blood shortages are to be expected anyway in the near future, all measures improving the supply of safe blood, including monetary compensation, should be objectively discussed without prejudice."
"Paid blood donation still has its defenders, who cite economic doctrines denying the existence of altruism per se, the inability of most countries with exclusively voluntary donations to achieve self-sufficiency and the supposedly successful use of selected groups of paid donors... (read more)