What is the difference between a shift and a movement along a curve?
A movement along the curve is caused by a change in price. A shift of the whole curve is caused by anything else: income, input costs, expectations, the price of substitutes. Confusing the two is the single most common diagram error and it usually makes the rest of the answer wrong.
This comes up on Business Economics Coursework, where it is answered in the context of the work itself.
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