Introduction

∆GDP i,2012-1992 =α+β ∆ lights i,2012-1992 + ε i,t (3)Where ∆GDP i, 2012-1992 . is GDP growth in country i. between 1992 and 2012 and ∆ lights i,2012-1992 . growth in night lights in country i. between 1992 and 2012. The (time-invariant) country fixed effects are swept out by the differenced form. ................
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