As plenty of others have said - nope, dissaving is very uncommon word. As a native American English speaker, I don't recall ever seeing it either.

One clue for future reference - the linked article had to clarify the meaning of the word _in the title_. That strongly indicates to me that, even if in certain areas the word is well understood, the author expected there to be confusion.

No. I've been a native English speaker my whole life and it was a very weird sounding title IMO.

No, it's a real word but it's not commonly used. It may be more common in some specialized areas, like economics.

As a native speaker, it was my first time seeing the word, too. Not common at all.

As a native speaker, this is the first I can recall seeing or hearing it.

It's an old word, but not a common word. Most of us (native English speakers) would never use it.

No, it might be common in economic circles but I've never heard it either.

It is common in economics

Nope, I’d never heard it either.

I guess "living beyond their means" is too plebeian for snooty economic type in their ivory towers?