<Dl> <Dd> P L = ∑ (p t ⋅ q 0) ∑ (p 0 ⋅ q 0) (\ displaystyle P_ (L) = (\ frac (\ sum \ left (p_ (t) \ cdot q_ (0) \ right)) (\ sum \ left (p_ (0) \ cdot q_ (0) \ right)))) </Dd> </Dl> <Dd> P L = ∑ (p t ⋅ q 0) ∑ (p 0 ⋅ q 0) (\ displaystyle P_ (L) = (\ frac (\ sum \ left (p_ (t) \ cdot q_ (0) \ right)) (\ sum \ left (p_ (0) \ cdot q_ (0) \ right)))) </Dd> <P> This compares the price of the old basket of goods q 0 (\ displaystyle q_ (0)) for the old or new prices . </P> <Dl> <Dd> P P = ∑ (p t ⋅ q t) ∑ (p 0 ⋅ q t) (\ displaystyle P_ (P) = (\ frac (\ sum \ left (p_ (t) \ cdot q_ (t) \ right)) (\ sum \ left (p_ (0) \ cdot q_ (t) \ right)))) </Dd> </Dl>

Who advocate that the current year quantities are taken as weight