The demand and supply schedules in this table list the quantity supplied and quantity demanded of oil workers at different salaries. Demand and Supply of Oil Workers Annual Salary Quantity Demanded Quantity Supplied $50,000 40,000 30,000 $55,000 35,000 35,000 $60,000 30,000 40,000 $65,000 25,000 45,000 $70,000 20,000 50,000