RDP 7902: Financial Modelling in Australia Equation (7)

\begin{array}{l} {ΔA}_{rt} = Σ_{j = 1}^{n} α_{rj} (A *_{jt} - A_{j, t - 1}) + δ_{r} {Δx}_{m} & r = 1, \dots, n . \end{array}