Suppose the demand for calendars increases in November. At the same time, the price of the ink used in the production of calendars increases. In the market for calendars, if the size of the shift of the demand curve is larger than the size of the shift of the supply curve, then the equilibrium quantity rises.

Demand Curve

A graphical representation showing how the quantity of a good or service demanded by consumers changes at different price levels.

Supply Curve

A graphical representation used in economics to show the relationship between the price of a good and the quantity of the good that suppliers are willing and able to supply at various prices.