The parameter δ i ,DJO ( t ) yields the following main specification based on a (almost insignificant) general effect, and a strong negative effect of about additional 1.655 percentage point reductions in growth for poor countries (i.e., having GDP per-capita [PPP] below the median in the base year): 22 δ i , DJO ( t ) = 0.00261 ⋅ T i ( t ) − T i 0 − 0.01655 ⋅ T i ( t ) − T i 0 1 GDP CAP , i ( t 0 ) < M e d i a n ( GDP CAP , i ( t 0 ) ) Kahn et al.
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