- A consumer's preference toward a good or service plays a large part in the demand for it and can be swayed by things like advertisements, reviews, seasons, celebrities, ect.
- The increase or decrease in a buyer's income will affect their capacity to purchase a product. A normal product will show an increase in demand when income increases and an inferior product will increase in demand when income decreases.
- A change in the price of a related product will also influence a consumer's desire and capability to consume particular goods. Substitute products, which are very similar to one another, will have a direct affect on each others demand, depending on their price. Complimentary products tend to be purchased together, therefore their demands are also inter-related.
- The future expectations of prices, sales, shortages, or incomes will alter when and how much of a good or service is demanded at a particular time.
- The final determinants that can change demand are an increase or decrease in the population or a change in the distribution of who is earning income in a specific demographic.
In the past five years, the demand for Mp3 players has dramatically decreased. Due to a change in the preference of consumers, who are now listening to music on their Blackberrys or iPhones, the need for a portable music device is becoming obsolete. The following table and graph will illustrate the decrease in the monthly demand from 2007 to 2012.
Price
|
Demand in 2007
|
Demand in 2012
|
175
|
100
|
10
|
150
|
200
|
20
|
125
|
300
|
30
|
100
|
400
|
40
|
75
|
500
|
50
|