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Halo Effect: Oprah’s Book Club

Celebrity Endorsement: Oprah's endorsement has a lot of power in the entertainment and publishing industries. The halo effect of her celebrity, combined with her loyal fan base, means that any book with her stamp of approval, will see a massive bump in sales. 

You can also find Oprah's Book Club in the Authority section of the Example Vault.

Oprahs Book Club Authority Halo Effect
Oprahs Book Club Stamp

More examples of the Halo Effect 

Halo Effect: Oprah’s Book Club