#really? 15. Income stability & equality

"Incomes will become more unequal within jurisdictions but more equal between them. Countries with a tradition of a very unequal distribution of incomes may be relatively more stable under these conditions than those jurisdictions where strong expectations of income equality have developed in the Industrial period."

This is another of the controversial implications from The Sovereign Individual: Mastering the Transition to the Information Age by James Dale Davidson & Lord William Rees-Mogg, Simon & Schuster, 1997

Is it really so?