The Marshal-Edgeworth index is calculated considering the mean of price and quantities between the base period (zero) and the current period (actual).
Thus, the Marshal-Edgeworth price index measures the change in total spent to acquire an average quantity between the base and current periods.
![\[ IM_P=\frac{\sum{(Q_0+Q_t)*P_t}}{\sum{(Q_0+Q_t)*P_0}} \]](http://informeeconomico.com.br/wp-content/ql-cache/quicklatex.com-cdca1515c6e7f003736cb1977fb96dd6_l3.png "Rendered by QuickLaTeX.com")
The Marshal-Edgeworth quantity index uses the average price between base and current period.
![\[ IM_Q=\frac{\sum{(P_0+P_t)*Q_t}}{\sum{(P_0+P_t)*Q_0}} \]](http://informeeconomico.com.br/wp-content/ql-cache/quicklatex.com-145d8fe4be4135dcf42d79e212a9f8ba_l3.png "Rendered by QuickLaTeX.com")
onde:
IMP = Marshal-Edgeworth price index
IMQ = Marshal-Edgeworth quantity index
Po = price on base period (zero)
Pt = price on current period (actual)
Q0 = quantity on base period
Qt = quantity on current period (atual)
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