How supply and demand determine equilibrium price and quantity in all types of markets?

In the supply and demand model of price determination, there is never a surplus or shortage of goods at the equilibrium level. The market always settles at the point where supply equals demand. If demand increases (decreases) and supply is unchanged, then it leads to a higher (lower) equilibrium price and quantity.

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.