Letters from the November 17, 2007, issue of Science News
By Science News, 15:58 PM April 15, 2008
"The Wealth of Nations" (SN: 9/1/07, p. 138) describes the difficulty of moving from exporting one product to exporting another in terms of a "distance" between various products. I would imagine, however, that a nation that already manufactures computers, for example, could easily move into calculators, but that the reverse might not be true. Did the researchers consider the directionality of their links?
Cesar Hidalgo of the University of Notre Dame...
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