Could help explain a few trends in American history

[Mark Thibodeau]

Aw, c'mon. That's not nice.

MT

On Sun, Feb 8, 2015 at 3:59 PM, Ian Livingston <igrlivingston at gmail.com>
wrote:

> http://www.economist.com/blogs/graphicdetail/2015/02/daily-chart-3
>
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