Did you get excited when you heard that the Dow Jones Industrial Average   crossed 20,000? Do you feel wealthier today than you did at the start of the week? Do you know why you felt the way you did when you heard what had happened?

Yes, you probably got excited. You may have felt slightly wealthier, and maybe you didn't know why you felt the way you did. But, honestly, it doesn't really matter if you felt or didn't feel anything after the Dow broke the 20,000 mark, because it really doesn't matter any more than when the Dow crossed the 19,478 mark. The 20,000 mark is just a larger, round number that seems like an accomplishment.

The Dow breaking the 20,000 mark really means nothing in terms of predicting what the market may do next.

But 20,000 is an easy number to compare with other round numbers like 14,000, 10,000, or even 6,500, all numbers that (sort of) do mean something. The Dow peaked on Oct. 9, 2007 at more than 14,166.97 before plummeting because of the financial crisis. It hit a postcrisis low on March 6, 2009 of 6469.95, down 54% from the peak.

When we talk about the 2007-2009 financial crisis, we typically don't remember the exact number the Dow peaked at, but we do remember it was just over 14,000. When we talk about the bottom, remembering the bleeding stopped at 6469.95 is difficult, but saying it fell to around 6,500 is easily remembered.

As for Dow 10,000, the first time that mark was broken was in 1999, and the last time was in October 2009. One could say that over the last 18 years the Dow has doubled, after not doing anything for the first 10.

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