Q.Using the base-year quantities $q_0$ (5, 4, 3, 2) and current-year quantities $q_1$ (6, 5, 4, 3) for Commodities A, B, C, D from the earlier worked examples, calculate the Simple Aggregative Quantity Index Number.

A simple aggregative quantity index works exactly like the simple aggregative price index, except it sums quantities instead of prices — prices play no role here at all. …

Step 1 — Total the base-year and current-year quantities.

Step 2 — Apply the formula.

$Q_{01}=\dfrac{\Sigma q_1}{\Sigma q_0}\times100=\dfrac{18}{14}\times100=128.57$ …

Do not confuse this with a value index — the simple aggregative quantity index uses ONLY $\Sigma q_1/\Sigma q_0$; prices …