To maintain a price P,above the market-clearing price Po, the government can restrict supply to Q,either by imposing production quotas(as with taxi cab medallions)or by giving producers a financial incentive to reduce output(as with acreage limitations). △CS=-A-B △PS=A-C+payments for not producing(俳生产性支付) =A+B+DTo maintain a price Ps above the market-clearing price P0 , the government can restrict supply to Q1 , either by imposing production quotas (as with taxi cab medallions) or by giving producers a financial incentive to reduce output (as with acreage limitations). △CS = -A-B △PS = A - C + payments for not producing(非生产性支付) = A+B+D