2 ms·
Here is paper cited at the beginning of the article: http://sci-hub.io/http://www.nber.org/papers/w23552.pdf http://sci-hub.io/http://www.nber.org/papers/w23552
by stephenboyd 9y ago
Here is paper cited at the beginning of the article: http://sci-hub.io/http://www.nber.org/papers/w23552.pdf http://sci-hub.io/http://www.nber.org/papers/w23552.pdf