In depth
Before 1997 the public distribution system sold grain at common subsidised prices to all ration card holders. The 1997 change split households into BPL and APL groups with different prices and entitlements, with the aim of concentrating the subsidy on the poor. The Antyodaya scheme for the poorest households followed in 2000.
The main evidence on performance is a 2005 Planning Commission evaluation, which found that most subsidised grain issued from the Central Pool did not reach BPL families, partly through identification errors. Later academic estimates, based on household consumption surveys, put leakage at above 40% in 2011-12 and much lower in the 2020s, with falls attributed to State reforms such as wider coverage, lower prices and better delivery, and, after 2013, the National Food Security Act.
Leakage estimates compare grain issued with grain households report consuming and depend on survey design and treatment of State-run schemes, so authors differ on levels while agreeing on direction. The BPL-based design was replaced by population-share coverage under the 2013 law. Whether the 1997 design, State reforms or the later law deserves credit for lower leakage cannot be settled from these data. The 2005 findings point to weaknesses in the BPL-based design, while the later declines point to improvement through reform; the sources do not settle which factor contributed most.