This photo shows crowds gathering outside the New York Stock Exchange during the 'Black Thursday', 1929, October 29th, the day Wall street suffered its worst day ever.
This photo shows crowds gathering outside the New York Stock Exchange during the 'Black Thursday', 1929, October 29th, the day Wall street suffered its worst day ever. - 

This final note today. A couple of 'em actually.

First of all, just a nod to history. Today's the 19th of October. On this day in 1987, Wall Street treated us to something that's become known as Black Monday: the Dow Industrials were off almost 22 percent.

Put that in today's context? That's a drop of 2,600-something points. There are circuit breakers that'd stop that nowadays, but still. Something to think about.

Follow Kai Ryssdal at @kairyssdal