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$K N E X T I N D E X_{r, t} = (T r a d e I n d e x_{r, t} + 2 * I n v I n d e x_{r, t}) / 2$

$T r a d e I n d e x_{r, t} = l o g \frac{X R P A_{r, t} + M R P A_{r, t}}{G D P P O T_{r, t}} / l o g 1000$

<math>InvIndex_{r,t}=log\frac{XFDISTOCK_{r,t}+XFDISTOUT_{r,t}}{GDPPOT_{r,t}}/log500

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