These are the facts from the Great Depression:
The significant column is the percentage of the workforce unemployed.
The reported estimate made before the latest mandatory workforce closures was that in this case unemployment might reach 20%. Since the current non-agriculture workforce today is 150,000,000 or so that would mean 30,000,000 unemployed.
Of course, there was an option available in 1941 that might not be practical today but was proven to turn a Depression into the longest, strongest prosperity cycle ever seen.