Is it common to use preposition "in" after "increase"? What is the difference between "increase in" and "increase of"?
Yes, it is very common to use the preposition "in" after "increase". This preposition is more common than "of", and in most cases, it is most grammatically correct to say "an increase in" instead of "an increase of". Generally the only time you should use "an increase of" is when there is a specific number or amount that follows. If a noun follows, you should always use "an increase in". Ex: The rainfall has caused an increase in plant production. Ex: Last year, enrollment at the school had an increase of 10%.
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