Non-Price Determinants of Demand (DP IB Economics)
Revision Note
Shifts of the Demand Curve
There are numerous factors that will change the demand for a good/service, irrespective of the price level. Collectively these factors are called the non-price determinants of demand and include
Changes in real income
Changes in tastes/preferences
Changes in the price of related goods (substitutes and complements)
Changes in the number of consumers
Future price expectations
Changes to each of the non-price determinants, shifts the entire demand curve (as opposed to a movement along the demand curve)
A graph that shows how changes to any of the non-price determinants shifts the entire demand curve left or right, irrespective of the price level
For example, if a firm increases their Instagram advertising, there will be an increase in demand as more consumers become aware of the product
This is a shift in demand from D to D1. The price remains unchanged at £7 but the demand has increased from 15 to 25 units
An Explanation of how each of the Non-Price Determinants of Demand Shifts the Entire Demand Curve at Every Price Level
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Changes in real income |
| Income | D Increases | Income | D Decreases |
Changes in taste/preferences |
| Good becomes more preferable | D Increases | Good becomes less preferable | D Decreases |
Changes in the prices of substitute goods (Related goods) |
| Price of Good A Increases | D for | Price of Good A Decreases | D for |
Changes in the prices of complementary goods (Related goods) |
| Price of Good A Increases | D for | Price of Good A Decreases | D for |
Changes in the number of consumers |
| Population Increases | D Increases | Population Decreases | D Decreases |
Future price expectations |
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Examiner Tip
The difference between a movement along the demand curve and a shift in demand is essential to understand. You will be repeatedly examined on this and it is important that you use the correct language to show that you understand the difference between a change in quantity demanded and a change in demand.
When price changes (ceteris paribus), there is a movement along the demand curve resulting in a change to quantity demanded. When a non-price determinant of demand changes, there is a shift of the entire demand curve resulting in a change to demand.
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