Equilibrium price: refers to the price when the supply and demand of a certain commodity are equal. The market mechanism causes the market price to always swing around the equilibrium price. Which of the following facts can be judged as the equilibrium price? ['A vendor sells big catfish, people scramble to buy it, and many people return empty-handed.', 'Forcibly sell the learning materials of the prescribed price to the subordinate units.', "Establishing the price of Fuzhou's distressed housing according to the price of Shanghai.", 'The consumer goods market price announced regularly by the price department.']