The Employees' State Insurance (ESI) scheme provides socio-economic protection to employees. Eligibility for coverage under the standard ESI scheme depends on the monthly wage limit. This limit was revised from ₹15,000 to ₹21,000 per month with effect from 1st January 2017. Given the reference to 2016/2017 in other questions, ₹21,000 is the relevant upper threshold for general employees around that period.