December 1929 isn't their mark. October 2008 is --something like 1800 pts over three weeks with no 'backstop'. Until Mr Obama put himself between the bank chiefs and 'the pitchforks'. Remember that?
o, look.
Wall Street selloff worsens on Mnuchin move, Washington drama

Treasury Secretary Steven Mnuchin called top U.S. bankers on Sunday amid the pullback in stocks and said he was calling a meeting of financial regulators to discuss ways to ensure "normal market operations."
[...]
Mnuchin spoke on Sunday with the heads of the six largest U.S. banks, who confirmed they have enough liquidity to continue lending and that "the markets continue to function properly."

But investors said his move to convene a call with the President's Working Group on Financial Markets [Mar. 18, 1988 EO UPDATE], known as the "Plunge Protection team," may have weighed on sentiment on Monday.

Whatever it takes.

Diversity is the key to economic and political evolution.