Demand Curve

Shifts in the Demand Curve: The demand for a good or service can change for a variety of reasons, such as changes in consumer income, preferences, or demographics. Shifts in the supply curve for a good or service come from reasons NOT directly tied to the price of the good or service itself. A decrease in demand is represented with a shift to the left, where demand is lower than what it originally was at all price levels, while an increase in demand is represented with a shift to the right, where demand is higher than what it originally was at all price levels.

Like with supply, note that an increase/decrease in demand (which occurs due to non-price determinants) is not the same as an increase/decrease in quantity demanded (which occurs due to a change in price).