Important causes of increase in demand are the following:
- When income of the consumer increases.
- When price of substitute goods increases.
- When price of complementary goods falls.
- When taste of the consumer shifts in favour of the goods due to change in fashion or climate.
- When price of the commodity is expected to increase in the near future.
- Increase in number of consumers.
- When the income of the consumer is expected to increase in the future.