\begin{eqnarray}
  \label{eq:mathbfPtp1}
  \bar{{P}}_{t+1} & = & \Pi \overbrace{\bar{{P}}_{t+1}^{{\pi}}}^{{P}_{t+1}} + (1-\Pi) \overbrace{\bar{{P}}_{t+1}^{\cancel{{\pi}}} .}^{\bar{{P}}_{t}}
\end{eqnarray}
