The interaction of supply and demand determine the price. There is no central direction. An equilibrium is a state of rest, there is no tendency or pressure for change. Market equilibrium occurs when the quantity demanded equals the quantity supplied. The market price adjusts to equate the desires of buyers and sellers.
Individuals are price takers , no one can alter the price.
Adjustments to market equilibrium. Prices below the equilibrium price. The excess demand for apartments puts upward pressure on price. Prospective tenants bid up rental rates. Prices above the equilibrium price.