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Demand curve: The quantity demanded at various price levels is plotted in figure by a demand curve.

Supply curve: A supply curve depicts the relationship between the price of an item or service and the quantity delivered over a specific time period.

Any factor can produce movement along the demand curve, as long as the demand curve does not shift. For example, a change in the price of a good or service can cause movement along the demand curve, but it does not alter the demand curve. A change in the price of products, likewise, generates movement along the supply curve but not a shift in the curve itself.

Explanation: A shift in one curve has no effect on another curve, although it does produce movement along the second curve. For example; factors like increase in income would shift demand right on the other hand, high price causes the supply curve to shift as the producer supplies more to increase revenue.