I'm not familiar with this case study but was wouldn't that be due to retaining asset ownership? Even if the dollar became worthless, presumably I'd still control all my assets(the stocks in my brokerage/401k, my car, etc.). The companies I have ownership for would still be able to generate goods/services for Dollar2.0
People storing money under their mattress presumably were in trouble, but doing that already puts you at risk of devaluation through inflation. And I'd imagine that most wealthy people are wealthy because they do exactly the opposite and hold assets instead of currency.
Consider, for example, that Berlin was bombed flat. Every industrial area was bombed. The houses were carpet bombed. The remaining factories were boxed up and shipped to the Soviet Union. The rest was looted by the troops. The young men were dead or in POW camps.
The people that told me this story were in Berlin at the time.
People storing money under their mattress presumably were in trouble, but doing that already puts you at risk of devaluation through inflation. And I'd imagine that most wealthy people are wealthy because they do exactly the opposite and hold assets instead of currency.