According to glen whitman, the most important concern with single-payer countries is the Waiting time
In a single-payer the national health insurance system, was demonstrated by the Canada, Denmark, the Norway, Australia, Taiwan and the Sweden, the health insurance is the publicly administered and most physicians are in the private practice. the U.S. Medicare would be the single payer insurance system if it applied for the everyone in the U.S.
In the wealthy nations, the single-payer health insurance typically available to all the citizens and to the legal residents. for Examples that include the United Kingdom's the National Health Service, Australia's Medicare and the Canada's Medicare.
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