Thanks! Good links. I had meant to read that paper by Ayres. He does not quote Hall, Cleveland, Odum, or Constanza in any of his references. It seems he discovered the relationship independently. He found the link between quality and GNp but does not have the two other correction factors that they discovered: product mix and household use. I need to read the longer paper. Thanks again!

It's an interesting paper, but obviously it's only one look at the situation. I imagine that both his "exergy" approach and the earlier "quality, product mix, and use" are attempts to quantify the fact that a fixed amount of energy can be used in very different ways to produce very different amounts of things. It's a key thing to examine, but I'm not sure how best to do so.

At any rate, you're more than welcome - finding, exchanging, and disseminating information is, IMHO, the most important (and bestest) function of the internet.