> Even if the cost for food and shelter is $1 per month, if there is no revenue, it is still too expensive, right ?

Why would there be no revenue? Right now you need a job that pays at least e.g. $2500/month to afford basic necessities. If those jobs disappear but the cost falls to $1/month, you don't need those jobs, because a job that pays $3/month leaves you in fat city, much less one that pays $50/month.

> If job loss goes faster than the price decrease, we might have a problem to solve.

That would be a transient problem while the prices catch up, not a long-term problem. You could solve that by e.g. printing some money in the short term.