What can trigger a movement along the demand curve?

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Variation in consumers' incomeAlteration in the quantity of buyersModification in promotional effortsA change in the supply curveA change in consumer preferences

Explanation

Movements along the demand curve occur due to changes in the price of the good itself. Factors like income changes, number of buyers, or advertising cause the demand curve to shift, not movement along it. However, a shift in supply affects the equilibrium price, leading to movement along the demand curve.