A movement along the supply curve is the result of a change in quantity supplied , while a shift in the supply curve is the result of a change in supply.
The supply curve is a positively sloped curve that shows the relationship between price and the quantity supplied. Price is on the y-axis and quantity supplied is on the x-axis. As price increases, the quantity supplied increase. If price declines, the quantity supplied declines.
Only a change in the price of the good leads to a change in quantity supplied. A change in the quantity supplied would lead to a movement either up or down along the supply curve. When there is a movement down, it means that the quantity supplied has increased and when there is a movement up, it means that the quantity supplied has decreased.
Other factors such as a change in the cost inputs or a change in the number of suppliers would lead to a change in supply. A change in supply would lead to either a leftward or rightward shift of the supply curve. When the supply curve shifts leftward, it means that supply has declined. When the supply curve shifts rightward, it means that supply has increased.
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