Supply and Demand Terminology
Understanding Demand and Supply Changes
Distinction Between Change in Demand and Quantity Demanded
- Economists often confuse terms; a change in demand is different from a change in quantity demanded.
- A change in demand indicates a shift in the entire demand curve, influenced by factors like income, population, and prices of substitutes or complements.
- Conversely, a change in quantity demanded refers to movement along a fixed demand curve due to price changes.
Illustrating Changes with Models
- An increase in demand shifts the demand curve right/upward, resulting in higher price and quantity exchanged.
- In contrast, an increase in supply leads to an increase in quantity demanded along the existing demand curve without shifting it.
Change in Supply vs. Quantity Supplied
- A change in supply involves shifting the entire supply curve due to factors like technology or input costs.