To piggy-back, the economy runs on the re-circulation of money and the reluctant to spend/lend money in 1929 contributed to why it was so bad (This is what Bernake got a nobel prize for showing [1]).
So you really want the government to synthetically make the money supply larger so that the lower velocity of money ends up being the "correct" velocity. Its like ordering 2 sides of fries at a restaurant so when somebody takes one of your sides you still end up with the desired amount.
However, since the government doesn't turn off the money printing when the shock is over there really is strong argument that they shouldn't turn it on during the shock because it just makes the next shock even worse.
So you really want the government to synthetically make the money supply larger so that the lower velocity of money ends up being the "correct" velocity. Its like ordering 2 sides of fries at a restaurant so when somebody takes one of your sides you still end up with the desired amount.
However, since the government doesn't turn off the money printing when the shock is over there really is strong argument that they shouldn't turn it on during the shock because it just makes the next shock even worse.
[1]: https://en.wikipedia.org/wiki/Ben_Bernanke#Nobel_Prize