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In a recent article, Paul Krugman showed these equations:

Import share expressed in terms of $\alpha,\,\sigma,\,\tau,\,t$

Which model is this? What do the symbols denote? Is the first symbol a v or nu?

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  • $\begingroup$ Given the curl on the right, I see a $\nu$ (nu) not a $v$ (vee) $\endgroup$ – Henry Nov 5 '16 at 10:10
  • $\begingroup$ This question would be greatly improved by a link to Krugman's article. $\endgroup$ – Giskard Nov 5 '16 at 10:25
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    $\begingroup$ @denesp As per your suggestion I've added a link, although it's an NYT piece so it may count towards peoples' articles per month limit. $\endgroup$ – J.G. Nov 5 '16 at 15:13

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