TeX source:

\left\{ \begin{array}{ll} d-{Tr,t}=d_{Tr,t−1}+αd_{Tr,t−1}(a+\overline{a}−c_{Tr}−2b_{11}d_{Tr,t−1}−b_{12}d_{Or,t−1})+τε_{1,t} \\ d_{Or,t}=d_{Or,t−1}+βd_{Or,t−1}(a−c_{Or}+θ(\overline{φ}−φ)−b_{21}d_{Tr,t−1}−2b_{22}d_{Or,t−1})(1−φ)+τε_{2,t} .\end{array} \right.