For example, the index captures the price of important commodities like milk from the retail markets; not at the producer level. In contrast to CPI, PPI measures price changes from the perspective of the seller. Sellers' and purchasers' prices differ due to government subsidies, sales and excise taxes, and distribution costs.
However, we must bear in mind that apart from the supply side factors, demand side factors, such as lower income and/or asset holdings also have a significant bearing on inclusive growth.