... and the Same Little Question Again

You remember the one. But this time I'm asking Paul Craig Roberts:

The private sector is no longer the answer, because the income levels of the vast majority of Americans are insufficient to bear the cost of health insurance today. To provide some perspective, the monthly premium for a 60-year old female for a group policy (employer-provided) with Blue Cross Blue Shield in Florida is about $1,200. That comes to $14,400 per year. Only employees in high productivity jobs that can provide both a livable salary and health care can expect to have employer-provided coverage. If a 60-year old female has to buy a non-group policy as an individual, the premium would be even higher. How, for example, is a Wal-Mart shelf stocker or check out clerk going to be able to pay a private insurance premium?

[snip]

What the US needs is a single-payer not-for-profit health system that pays doctors and nurses sufficiently that they will undertake the arduous training and accept the stress and risks of dealing with illness and diseases.

A private health care system worked in the days before expensive medical technology, malpractice suits, high costs of bureaucracy associated with third-party payers and heavy investment in combating fraud, and pressure on insurance companies from Wall Street to improve “shareholder returns.”

In the case of Mr. Roberts, I'll ask the whole question, because I'm pretty sure he'd consider it relevant: Where is the text in the Constitution that authorizes the central government to provide, or finance, medical services?