Competitive equilibrium is achieved when profit-maximizing producers and utility-maximizing consumers settle on a price that suits all parties.

Equilibrium quantity is when there is no shortage or surplus of an item. Supply matches demand, prices stabilize and, in theory, everyone is happy.

A dynamic equilibrium is formed in a reversible reaction when the rates of the forward and reverse reaction are equal and the amounts of the reactants and the products remains constant.

The equilibrium curve indicates the price at which the supply and demand for your product meet. Any change in the price, supply or demand can affect the entire curve.

Roy Radner, Existence of Equilibrium of Plans, Prices, and Price Expectations in a Sequence of Markets, Econometrica, Vol. 40, No. 2 (Mar., 1972), pp. 289-303 ...