For having hit unsustainable levels in 1971, it has sure held up well for the last 52 years. I would expect something unsustainable to do less sustaining. (No

For having hit unsustainable levels in 1971, it has sure held up well for the last 52 years. I would expect something unsustainable to do less sustaining. (Now, true, the federal debt was unsustainable under the Bretton Woods arrangement.)