Cassandra's answer is correct as far as it goes. Here is a bit longer answer:

The statement, "Tommy and Matthew are good friends" is neither a cause or an effect. It depends on the context.

In "Tommy and Matthew are good friends, so they went on a holiday together",it is a cause.

In "They both love soccer, so Tommy and Matthew are good friends", it is an effect.

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The cast of The Stop-Loss Effect - 2007 includes: Laura Castle as Samantha Mitchell Matthew Prater as Eric McClure

He was the most celebrated photographer in the United States and for a time enjoyed prosperity.

The "rich get richer" phenomenon in economics, where those who already have wealth or resources are able to accumulate more easily. In academia, the Matthew effect can be seen in successful researchers receiving more recognition and opportunities, leading to further success. In sports, star athletes may receive more endorsements and media coverage, enhancing their reputation and popularity.