What are the benefits are of equilibrium for buyers and sellers ?

If there equilibrium you are selling the ammount of the item buyers want to buy and there  is no shortage or surplus, buyers make up the demand side of the market and sellers make up the supply side of the market and as buyers and sellers interact, the market will tend toward an equilibrium price.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

the crusaders are identified in the painting;

c. by the red crosses on their backs