Earlier quoted context omitted.
Hoarding wealth is bad for the economy, as it lowers the velocity of money. See: https://fred.stlouisfed.org/series/M2V Our current policy is to paper over bank liquidity or other problems by printing money. Big institutions and the mega-rich are hoarding massive quantities of cash. The economy as a whole would be better off if billionaires were doing stuff with their money rather than hoarding shares.
You do realize that nobody keeps that cash on hand, right? It’s in banks where it gets lent out, thus participating and contributing to the economy. "Hoarding" is nonsense.
The effect is almost identical.