"Index number acts a barometer in an economy "Justify
kindly refer given link and scroll to topic "Uses of Index number" for similar query.
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/index-numbers/443_2500_6441
Regards
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/index-numbers/443_2500_6441
Regards