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When A impacts B, do we always say "A has an impact on B"? Or does it depend on what A and B are? For example, is it right to say, "the recession had a great impact in Dubai?"

I have also seen the proposition "to" being used with the word impact.

Which is the correct form?

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"Impact in Dubai" would be fine, if you were to then discuss the segments of the Dubai economy and/or population that were affected. – Hot Licks Dec 23 '15 at 4:16
up vote 6 down vote accepted

I don't do "correct", but I would normally use "impact on".

Any other preposition I would interpret as an adjunct, not a complement (i.e. not part of the meaning of "impact", but saying something about the where, the when or the how).

So I would interpret "a great impact in Dubai" as "a great impact on something obvious from context, in Dubai".

The only like case I can think of for "impact to" would be something like "have a great impact to new arrivals", meaning "have a great impact on something unspecified, as perceived by new arrivals".

Edit: it occurs to me that "impact" now has a separate meaning that doesn't require a complement at all. So "make a great impact in Dubai" is perhaps an example of this: the "in Dubai" is still an adjunct. "Make a great impact on Dubai" would says that it is somehow changing Dubai or its people.

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Impact on means "a marked effect or influence"; impact means "the action of one object coming forcibly into contact with another."

Our regional measures have had a significant impact on unemployment.
There was the sound of a third impact.

You could use impact in in sentences similar to the following one:

The government's measures had had a significant impact on the economy; the impact in our town has been even more evident.

In the second sentence, "on the economy" is implicit, after "the impact."

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"Impact from" when something had happened out of that impact. Eg: All were killed due to the impact from the crash.

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