But for the first time, India's decennial census - which was set to be held in 2021 - has been delayed, with no clarity on when it will be held. Experts say they are worried about the consequences of this, which range from people being excluded from welfare schemes to incorrect resource allocation."The census is not simply a count of the number of people in a country. It provides invaluable data needed to make decisions at a micro level," says Professor KP Kannan, a development economist who has worked extensively on poverty and inequality.

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