the effect of changes in price on quantity demanded, i.e. movement along the curve

The effect of changes in price on quantity demanded is known as the law of demand in economics. This law states that, all else being equal, as the price of a product increases, quantity demanded decreases; conversely, as the price of a product decreases, quantity demanded increases.

Here are the steps to understand this concept:

1. Identify the goods or services: The first step is to identify the specific goods or services that you're examining. For example, let's take a product like a smartphone.

2. Price Increase: If the price of the smartphone increases, consumers may feel it is too expensive and not worth the cost. As a result, they may decide to not buy the smartphone or to buy fewer smartphones. This leads to a decrease in quantity demanded.

3. Price Decrease: Conversely, if the price of the smartphone decreases, consumers may feel it is now a good deal and worth the cost. As a result, they may decide to buy the smartphone or to buy more smartphones. This leads to an increase in quantity demanded.

4. Movement along the demand curve: These changes in price and quantity demanded are represented on a graph known as the demand curve. A movement along the demand curve is caused by a change in the price of the good or service.

5. Downward Sloping Demand Curve: The demand curve is typically downward sloping, reflecting the inverse relationship between price and quantity demanded. As the price decreases, we move down and to the right along the demand curve, indicating an increase in quantity demanded. As the price increases, we move up and to the left along the demand curve, indicating a decrease in quantity demanded.

Remember, this law only applies when all other factors are held constant. If other factors change, such as income or preferences, they can also affect the quantity demanded.