| PED |
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| n | If the price
of prophys fell by 20% and |
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| the quantity
of prophys bought rose by |
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| 30% then the
value of PED would be |
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| +30%/–20% =
–1.5. In this case the |
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| demand for
prophys tests is price |
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| elastic,
i.e. sensitive to changes in |
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| price. |
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