Th e consume r pric e inde x i s use d to
A.
monito r change s i n th e leve l o f wholesal e price s i n th e economy.
B.
monito r change s i n th e cos t o f livin g ove r time.
C.
monito r change s i n th e leve l o f rea l GD P ove r time
D.
monito r change s i n th e stoc k market.