Sandbox

$TRADSRAT_{\gamma ,c-1}=\mathbf {TRADSRAT} _{\gamma ,c-1}^{t-1}*{\frac {AnalFunc(GDPPCP_{\gamma })}{AnalFunc(GDPPCP_{\gamma }^{t-1})}}+\mathbf {CultShTS} _{\gamma -cultural}^{t}+\mathbf {tradsratadd} _{\gamma }^{t}$

where

<math>\mathbf{CultShTS^t_{\gamma-cultural}=F(\mathbf{TRADSRAT}^{t-1}_{\gamma,c-1},AnalFunc(GDPPCP^{t-1}_{\gamma})