RDP 2018-08: Econometric Perspectives on Economic Measurement Equation (32)

\begin{array}{l} \sum_{u} f (\frac{p_{t u v}}{q u a l i t y_{t v}}) = U_{t v} f (\frac{p_{t \bar{u} v}}{q u a l i t y_{t v}}) & \forall t, v \end{array}