Not one I shall bother to read.
There is an alternative: a constant economy.
That is essentially his uncle, Teddy\’s, concept of a stock economy (as opposed to a flow one) laid out in Blueprint for Survival. A useful concept and while Teddy was something of a nutter he did in fact come up with some interesting and valuable thoughts (for example, the necessity of pricing externalities into market prices).
There\’s nothing of Zac\’s I\’ve read over the years that makes me think he even understands the implications of these concepts nor how far things have moved in the 35 years since Teddy published.
So I\’ll just read the old one on my shelves and not slaughter another tree or two to read the warmed up mess from the nephew.