We have seen a number of dark days for stock markets all around the world in the past months. But how frightened should we be? Is the next Great Depression upon us? How can we distinguish a small crisis from a huge one? One way to deal with these questions and to calm our feelings of panic is to look closely at a single bad day. When we do that, the details can show us that the bigger picture may not be as bad as we fear, and, hopefully, quell our feelings of panic.

Let’s look back at September 29. On that day, the Dow Jones Industrial Average fell 7% and the S&P dropped by 8.8%. The Dow’s declines were the largest since the 9/11 attacks, and the S&P had its worst day since Black Monday in 1987. Media headlines included comparisons to the “Crash of 1929” and even “The Great Depression,” but, in spite of all of this, were things really as bad as they seemed?

The first thing to do when we have a horrible day like this is to look at as many of the details as you can. Now, when you do this you should expect some bad news. But the real insight will come when you compare the details of a single bad day to the details of an even worse day that history has proven to be a true market crash.

So let’s put September 29 into perspective.

Before the US stock markets opened on that morning, bad news was already spreading. The financial crisis had reached Europe. Governments were forced to bail out the Belgium bank Fortis, the U.K. nationalized mortgage lender Bradford & Bingley, and Germany’s Hype Real Estate Holding. At home, Wachovia announced that it was in talks with several firms to be sold. Wachovia, in fact, did not fail, but scared customers had pulled their funds after Washington Mutual’s collapse.

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