A country club usually only allows members to purchase tickets for its celebrity golf tournament, but the club is considering allowing non-members to purchase tickets this year. The demand and supply schedules are as follows: Price Quantity Demanded by Quantity Demanded by Quantity Supplied Members Noe-members 1000 500 800 600 400 SIO $15 $20 $25 $30 400 300 200 100 600 600 600 600 600 . If only members are allowed to purchase tickets to this year's celebrity golf tournament, then what will be the equilibrium price? If both members and non-members are allowed to purchase tickets to this year's celebrity golf tournament, then what will be the equilibrium price? If both members and non-members are allowed to purchase tickets to this year's celebrity golf tournament and the country club sets the ticket price at $30, then there will be shortage or surplus number in the market? If both members and non-members are allowed to purchase tickets to this year's celebrity golf tournament and the country club sets the ticket price at $20, then there will be shortage or surplus number in the market?