Ramaswami: Various models are being proposed to bring us out of this lockdown. Although, as Harvard’s Ashish Jha has forcefully argued, it might be that we know too little about the status of Covid-19 in our populations to make that decision just yet, it is now clear that part of the strategy is a move from a general to a “graded” lockdown. This graded system punishes states if they are judged to be insufficiently compliant with the lockdown rules, and uses a threshold Covid-19 prevalence to stop all movement at the level of the district. Apart from the fact that states will now have a disincentive to report cases, this strategy also raises the question of whether there are other, perhaps more nuanced approaches that can be used to create finer categories.