$1$

When price elasticity of demand is $>1$

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Question $1$

$2$

When price elasticity of demand is $<1$

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Question $1$

$3$

When price elasticity of demand is $=1$

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Question $1$

$4$

When the demand curve is perfectly horizontal

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Question $1$

$5$

When the demand curve is perfectly vertical

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Question $1$

$6$

When cross$-$price elasticity is positive

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Question $1$

$7$

When income elasticity of demand is negative

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