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<math>XC_{r,s}=XBASE_{r,s}*(1+(\frac{PRI_{r,s,t-1}*EXRATE_r-WP_s}{WP_s}))^{elxpr1}*(1+(\frac{PRI_{r,s,t-1}*EXRATE_r-WP_s}{WP_s}-\frac{PRI_{r,s,t-2}*EXRATE_{r,t-1}-WP_{r,t-1}}{WP_{r,t-1}}*\mathbf{elastrpr}_s))^elxpr2