Because every place worth going can be found on a topo map.
I have seen so many graphs comparing the current crisis to previous ones. It’s amazing how the choice of economic indicator, be it % S&P losses, total Dow losses, jobs lost (either % or total) etc. can really change the story being told. The interactivity, simplicity, and diverse information provided by this NYT graph make it a very nice visualization. Normalizing all the axis in terms of percentages is both fair and allows for real direct comparisons.
That said, I’d really like to see the option of switching between different financial indicators. The choice of the S&P seems fair, but without any other options it drastically shapes the story being told. In short, a great start, but it would be easy to do so much more.