In economics, the change in quantity demanded and the change in demand are two different concepts. Change in the quantity demanded is the change in the quantity demanded by the consumers to a decrease or increase in price of a product. On the other hand, the change in demand is the change in demand due to different determinants of demand while maintaining price at a consonant level (Mankiw, 2012). Change in quantity demanded can be measured by a movement in the demand curve while the change in demand is measured by a shift in the demand curve.

Different factors can lead to a change in demand. These include income, consumer preferences, changes in population, price of other related goods and future expectations. When any of these factors change while maintaining price constant, the demand curve will shift causing a change in demand. Factors that can lead to changes in supply include production cost, technology, number of sellers and future prices expectations. When a change occur in any of these factors while keeping the price constant, the supply curve shifts causing a change in supply (Mankiw, 2012).

Consider the iPhone market in the mobile industry. When Apple launches a new iPhone, consumers always rush to purchase the new phone. Launching a new mobile phone cause a change in the consumer preferences. Consumers prefer the latest fashion and tastes. For example when apple released the iPhone 6, the demand for iPhone 5 reduced. This is a change in demand since even if the price of iPhone 5 remains constant, the change in consumer preferences will cause a shift in the demand curve.

References

Mankiw, N. (2012). Principles of microeconomics. Singapore: South-Western Cengage Learning.

 
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