WHEN P. Chidambaram promised in his Budget speech a discussion paper on all subsidies—visible and hidden—he blazed a trail in a vast, unch-arted and confused territory. Barring the Andhra Pradesh Government's recent move to lay bare its financial skeletons before the public, neither the Centre nor the states have tried to harness this white elephant. Subsidies have always been considered a necessary evil, to ostensibly keep the poor happy and serve broad social and economic goals (read: protecting the vote bank).