Given the following diagram Point A to B is change in quantity supplied (Movement along ssupply curve) and Point A to C (Shift in Supply curve) is Change in Supply.
The decrease in supply is a result of the price change. We might say that a change in quantity supplied resembles movement along the supply curve because if the price changes, the quantity supplied varies along the original supply curve.
Anything other than price changes causes changes in supply. Let's assume that the supply curve will move from its initial position as a result of technological advancement. Thus, a change in supply is similar to a shift in the supply curve.
A shift from place A to place B: The supply in this instance has changed along the initial supply curve. As a result, the quantity delivered has changed.
Point A to Point C changed: The supply curve has changed; specifically, it has shifted to its left. It is a change in supply as a result.
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