If something happens to alter the quantity supplied at any given price, then

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Quizplus · Accepted Answer

When the quantity supplied changes at any given price, it indicates a change in supply, not just a change in the quantity supplied. This leads to a shift in the supply curve, either to the left or to the right, depending on whether the supply decreases or increases, respectively. Moving along the supply curve would imply a change in quantity supplied due to a change in price, not an external factor altering supply at all prices.

If Something Happens to Alter the Quantity Supplied at Any