Covid-led reverse migration to Bihar halved remittance, says study SECTIONS Share Synopsis Conducted between October 2020 and January 2021, the study was compiled by researchers from the Delhi-based Institute for Human Development and the Centre for Development Economics and Sustainability at Australia’s Monash University, and was funded by the International Growth Centre. Agencies Representative Image More than half the migrant workers from Bihar returned from cities following the outbreak of Covid-19, which led to a nationwide lockdown last year, shelling out a hefty Rs 3,000 for the journey on average and spending about 149 days in their native villages, a new study has found.