A percentage change is a way to express a change in a variable. It represents the relative change between the old value and the new one.
For example, if a house today is worth $100,000 and the year after its worth goes up to $110,000, the percentage change of its worth can be expressed as
It can then be said that the worth of the house went up by 10%.
More generally, if V1 represents the old value and V2 the new one,
When the variable in question is a percentage itself, it is better to talk about its change by using percentage points, to avoid confusion between relative difference and absolute difference.
Read more about this topic: Relative Change And Difference
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