Replying to @MaxCRoser
.@MaxCRoser purchasing power + hajnal line (http://hbdchick.wordpress.com/2014/03/10/big-summary-post-on-the-hajnal-line/ …)pic.twitter.com/c2uH6iuYe6
10:52 AM - 2 Mar 2015
0 replies
3 retweets
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