Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: But because these claims are more difficult to evaluate and have been coming in more slowly, the company has no estimate of the impact of the earthquake on fourth-quarter results. In New York Stock Exchange composite trading Friday, Aetna closed at $60, down 50 cents.

impact