NEW DELHI: Arguing that policy matters should not be the sole prerogative of Centre , the Supreme Court today said that court should also be an instrument in deciding issues related to the formulation of government policies."Why Centre always take the stand that policy matters should be left for Parliament and be not decided by court?” SC asked.The above argument was made during a hearing of PIL filed by NGO Lok Prahri alleging that there has been an exponential increase in the assets of MPs and MLAs The apex court also said that its order on mandatory disclosure of source of assets by politicians was welcomed by all political parties despite Centre's objection."Can MPs & MLAs be allowed to fix their own salary and perks?" SC asked and instructed Centre to take a categorical stand on setting up of independent and permanent mechanism for fixing salary and allowances of MPs and MLAs.Last week, the Supreme Court had termed the possession of disproportionate assets by MPs and MLAs “a culpable offence”.SC had said that such lawmakers must be disqualified from the legislative bodies as accumulation of wealth in the hands of elected representatives beyond known sources of income “paves way for the rule of mafia substituting the rule of law”.A bench of Justices J Chelameswar and S Abdul Nazeer had said that “such people are enemies to all good governments” and they should be disqualified from membership of legislative bodies. It, however, had put the ball in the Centre’s court to amend the rule to make provision of disqualification on the ground of amassing wealth beyond the known sources of income.The court had passed the order on a PIL filed by NGO Lok Prahri alleging that there had been exponential increase in the assets of 26 Lok Sabha MPs, 11 Rajya Sabha MPs and 257 MLAs, as was reflected in their election affidavits.