The good Ph.D. is not the least bit interested in any alternative. I brought to his attention one that would not limit income/wealth--but would have demographics governing output, with no unemployment or poverty at any level of total output. It would put a (TBD) limit on the accumulation of cash and extraneous assets of corporations (i.e., assets unrelated to the business itself, such as stocks of other corporations, bonds, real estate, etc.). I received no response.

"De-growth with Only Positive Effects" (a "6 min read" here in Medium--not behind the paywall)