Introduction to principles of microeconomics/Market equilibrium

Introduction to market equilibrium
"The logic of the model of demand and supply is simple. The demand curve shows the quantities of a particular good or service that buyers will be willing and able to purchase at each price during a specified period. The supply curve shows the quantities that sellers will offer for sale at each price during that same period. By putting the two curves together, we should be able to find a price at which the quantity buyers are willing and able to purchase equals the quantity sellers will offer for sale." - Principles of Microeconomics

When left alone, a market will move to equilibrium; in other words, the market price will move to the level at which the quantity supplied equals the quantity demanded. However, this outcome can be both desirable and undesirable for buyers or sellers.