The economy is a circular river system. If it stops one day, there is going to be areas of drought in places, as well as huge reservoirs protected by dams. Money does not disappear, it only moves. You lose money on stocks, someone else on the other side of the world made money with their short position.
Perhaps that dollar is held up in some whale's cash account after they closed their positions. You would tax that whale for that cash, and redistribute it to the working class to afford food and shelter.
In any recession, the big stall is capital being too skiddish to pay for labor, resulting in lowered consumer spending, justifying less demand for labor, and creating a worsened financial crisis due to even lower consumer spending levels. If you are able to keep the working class afloat, you can conceivably keep consumer spending afloat, and therefore keep the economy afloat, even if capital is fearful.