RDP 2003-11: How Should Monetary Policy Respond to Asset-Price Bubbles? Equation (C11)

X_{s}^{(k)} (j) = {\begin{array}{l} γ_{s + j} & , & 1 \leq j < k \\ - Σ_{i = 1}^{s + k - 1} γ_{i} & , & j = k \\ 0 & , & k < j \leq N_{s} . \end{array}