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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 
for base and comparison periods, respectively. Average units volumes,
and
Then, the period-to-period trend in total dollar volume is given by 
where TN is again the trend in the total HH count, TPq is the trend in average units per HH, and TLp is the trend in average price per unit. The trend in average units is weighted by comparison prices, and thus one might view TPq as a Paasche index of unit volume. Since the trend in average prices is weighted by base units volume, one might thus view TLp as a Laspeyres price index. An alternative decomposition of the trend is 
where TLq is a Laspeyres index of units volume and TPp is a Paasche price index. A second alternative decomposition of the trend is
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and 
, and average prices per unit, 
and 
, are defined in the obvious way. Also, define the G × 1 vectors of average unit volumes and average prices per unit
