\begin{eqnarray}
    \Delta \mathbf{C}_{t+1} & = & (1-\Pi)\left(1+\underbrace{(\rBet/\RBet)}_{\approx 0}\right) \Delta \mathbf{C}_{t} + \underbrace{\Pi \xi_{t+1}}_{\equiv \epsilon_{t+1}} \label{eq:dCQuadSticky}
\end{eqnarray}
