This is what's known as "rationing" -- and it's what we're all going to see lots more of if health care "reform" goes through Congress. When there are promises that health care coverage will be both cheaper and offered to more people, there will be shortages of everything, compared to what we have now. And so the laws of supply and demand dictate that rationing will occur. Presumably, a federal bureaucracy will have to decide who's entitled to what, and when.
If you're elderly, the linked piece should send a chill through you. Not just because it's unsettling to be denied a vaccine that may save your life -- but because if ObamaCare goes through, this is just the tip of the iceberg.
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