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A demand curve illustrates the relationship between the price of a product and the quantity of the product that consumers are willing and able to purchase at that price. The Law of Demand states that as the price of a good decreases, the quantity demanded increases, and vice versa, all else being equal.

A movement along the demand curve occurs when there is a change in the quantity demanded of a good due to a change in its price. Factors that would cause a movement along the demand curve include changes in the price of the good itself and consumers' income (if the good is a normal good). For example, if the price of a product decreases, consumers are likely to purchase more of that product and thus the movement along the demand curve would be upwards.

The supply curve illustrates the relationship between the price of a product and the quantity of the product that producers are willing and able to offer for sale at that price. The Law of Supply states that as the price of a good increases, the quantity supplied increases, and vice versa, all else being equal.

A movement along the supply curve occurs when there is a change in the quantity supplied of a good due to a change in its price. Factors that would cause a movement along the supply curve include changes in the price of the good itself and changes in the production costs. For example, if the price of a product increases, producers are likely to produce more of that product and thus the movement along the supply curve would be upwards. To summarize, movements along the demand curve are mainly caused by changes in the price of the good and the consumers' income (if the good is a normal good), while movements along the supply curve are mainly caused by changes in the price of the good and changes in production costs.