Price $0 $4 $8 $12 $16 $20 BO Firm W's Firm X's Firm Y's Firm Z's Quantity Quantity Quantity Quantity Supplied Supplied Supplied Supplied 0246 DO 8 10 0 5 10 15 20 25 00 4 8 12 855 16 20 increases by 7 units. decreases by 28 units. 0 WO Refer to the Table. If these are the only four sellers in the market, when the price decreases by $4, the market quantity supplied AO increases by 14 units. decreases by 14 units. 3 6925 12 15