Is it affected by or effected by?

It can be affected by or effected by.

It is typically affected by, meaning “influenced by” (e.g., “The harvest was badly affected by the poor weather conditions”).

However, it can be “effected by” if you mean “initiated by,” “implemented by,” or “caused by” (e.g., “This was one of the positive changes effected by the organization”). The word effect is not commonly used as a verb like this in everyday language.

QuillBot’s free Grammar Checker will help you to avoid errors with commonly confused words like “affect” and “effect.”