when the slope of the demand curve is zero, its elasticity of demand is _____
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If the demand curve is horizontal its slope is zero, but its elasticity is infinite. By contrast, if the demand curve is a vertical straight line its slope is infinite, but elasticity is zero. If the demand curve is a straight line its slope is constant, but elasticity falls as price drops.
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When the slope of the demand curve is zero, its elasticity of demand is _infinite_.
When the slope of demand curve is zero then it is parallel to the x axis or it is horizontal.
Infinite elasticity of demand means perfectly elastic demand.
The zero slope implies that little decrease in the price of a commodity will make the consumers buy a large amount of that commodity. Whereas a little increase in the price of a commodity will make the consumers altogether leave that commodity or switch to another commodity. For eg. demand of gold.
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