Shifting Demand

Here are some things that would cause the demand curve to shift:

1. A change in income for the average consumer.

If an increase in income causes an increase in the demand for a particular good, that good is called a "normal" good. Example: steak.
If an increase in income causes a decrease in the demand for a particular good, that good is called an "inferior" good. Example: red beans.

2. A change in the population.

3. Changes in the prices of other goods.

4. Changes in consumer tastes.